Storage case for items

Abstract

To provide an article storage case which can be used for freezing as well and can be easily folded.SOLUTION: In a basic state, an inner case body 10 is in the inner case basic state in a rectangular parallelepiped shape, an outer case body 30 is in the outer case basic state in the rectangular parallelepiped shape as well and a lid body 260 is in the lid body basic state. In a folded state, the inner case body 10 is in the inner case folded state, the outer case body 30 is in the outer case substantially folded state and the lid body 260 is in the lid body both edges joined folded state. The inner case body 10 changes from the inner case basic state into the inner case folded state, thus, the lid body 260 changes from the lid body basic state into the lid body both edges joined folded state as well, the outer case body changes from the outer case basic state into the substantially folded state as well and this article storage case changes from the basic state into the folded state.SELECTED DRAWING: Figure 9B

Description

【Technical Field】 【0001】 The present invention relates to a case for accommodating an article. 【Background Art】 【0002】 In many cases, a case (container, box) is used to transport various articles. In order to transport while maintaining a cold storage state or a heat insulation state, a case having a heat insulation effect is used. In the case of refrigeration, compared with the case that can also be used for freezing, it is sufficient even if it does not have a very large heat insulation effect. However, in order to make it usable for freezing, it is necessary to have a large heat insulation effect. For this reason, a case having a small heat insulation effect for refrigeration has its outer shell portion (bottom, two pairs of side wall portions, lid portion) formed of a sheet-like (thin) material. On the other hand, a case having a large heat insulation effect that can also be used for freezing has its outer shell portion formed of a thick plate-like (thick) material. 【0003】 By the way, from the viewpoint of space saving, it is desirable that the article storage case is small when the article is not stored (that is, in an empty state). Therefore, a foldable article storage case has been developed. An example thereof is disclosed in Patent Document 1. 【0004】 The above can easily perform the folding operation and the reverse restoration operation. However, it is for refrigeration and is formed of a sheet-like material, and it can be manufactured without much consideration of its thickness. 【0005】 On the other hand, for an article storage case that can also be used for freezing, as described above, since it is formed of a thick plate-like material, there are foldable ones, but there are no ones that can easily perform the folding operation and the reverse restoration operation. In other words, considering the thickness of the outer casing, it is impossible to directly apply the design described in Patent Document 1 to an article storage case that can also be used for freezing. [Prior art documents] [Patent Documents] 【0006】 [Patent Document 1] Japanese Patent Publication No. 2001-88849 [Overview of the project] [Problems that the invention aims to solve] 【0007】 The present invention aims to provide an article storage case that can also be used for freezing and is easily foldable. [Means for solving the problem] 【0008】 A first aspect of the present invention is an article storage case in which an inner case body is housed in an outer case body, wherein the inner case body has an inner case bottom plate portion, a pair of inner case first side plate portions, and a pair of inner case second side plate portions, the inner case bottom plate portion is rectangular in shape with a pair of bottom plate first sides and bottom plate second sides, and has a plurality of divided bottom plate portions divided along a bottom plate portion folding line that extends parallel to the pair of bottom plate first sides, between a basic state of the bottom plate portion that is a horizontal flat plate and a folded state of the bottom plate portion that is folded downward in a convex shape along the bottom plate portion folding line. The phase can be changed, and the pair of first side plates of the inner case are pivotably connected to the pair of first sides of the inner case bottom plate at their lower edges, the pair of second side plates of the inner case correspond to the pair of second sides of the inner case bottom plate, are not connected to the said second sides of the inner case bottom plate at their lower edges, and are pivotably connected to the respective side edges of the pair of first side plates of the inner case at their respective side edges, and are divided along the folding line of the second side plate that extends in the height direction The inner case has multiple divided side plate sections, and is capable of transitioning between a basic state of the second side plate section, which is a flat plate shape, and a folded state of the second side plate section, which is folded inwardly in a convex shape along the folding line of the second side plate section. The inner case body has a basic state in which the pair of first side plate sections of the inner case are separated from each other, the bottom plate section of the inner case is in the basic state of the bottom plate section, and the pair of second side plate sections of the inner case are in the basic state of the second side plate section, and the pair of first side plate sections of the inner case are in close proximity to each other, and the bottom plate section of the inner case is folded. This is an article storage case in which the inner case is in a bent state, and the pair of second side plates of the inner case can change phases between the bent state of the second side plates and the folded state of the inner case, and the outer case body is formed of a flexible sheet, and without hindering the change of phase between the inner case body and the folded state of the inner case, the outer case body can change phases between the outer case basic state corresponding to the inner case basic state and the outer case substantially folded state corresponding to the folded state of the inner case in accordance with the change of phase of the inner case body. 【0009】 The term "rectangular" refers to a broad range of shapes, including "square." 【0010】 The following effects and advantages can be obtained with this embodiment of the article storage case. The bottom plate portion of the inner case body can be folded downward in a convex shape along the bottom plate folding line, the pair of first side plates of the inner case can pivot relative to the pair of first sides of the bottom plate portion at their lower edges, the pair of second side plates of the inner case are not connected to the second sides of the bottom plate portion at their lower edges, can be folded inward in a convex shape along the second side plate folding line, and can pivot relative to the respective side edges of the pair of first side plates of the inner case at their respective side edges. Furthermore, the inner case body can change between a basic inner case state in which the pair of first inner case side plates are separated, the inner case bottom plate is in its basic bottom plate state (a horizontal, flat plate shape), and the pair of second inner case side plates are in their basic second side plate state (a flat plate shape), and a folded inner case state in which the pair of first inner case side plates are close together, the inner case bottom plate is in a folded bottom plate state (bent downwards in a convex shape along the bottom plate folding line), and the pair of second inner case side plates are in a folded second side plate state (bent inwards in a convex shape along the second side plate folding line). Furthermore, the outer case body is located outside the inner case body and does not hinder the phase change between the inner case body's basic state and its folded state. In conjunction with the phase change of the inner case body, it is possible to change between the outer case body's basic state (the state corresponding to the inner case body's basic state) and the outer case body's partially folded state (the state corresponding to the inner case body's folded state). 【0011】 Thus, in this item storage case, by manipulating a pair of second side plates of the inner case as needed, and changing the phase of the pair of first side plates of the inner case between a separated state and a close-proximity state, it is possible to change between the basic state (the inner case body is in the basic inner case state and the outer case body is in the basic outer case state) and the folded state (the inner case body is in the folded inner case state and the outer case body is in the nearly folded outer case state). Therefore, in this item storage case, even if the elements constituting the inner case body (inner case bottom plate, inner case first side plate, inner case second side plate) are thick, plate-like materials with thermal insulation properties, it is possible to easily switch between the basic state and the folded state. Thus, this storage case for goods can also be used for freezing and is easily foldable. 【0012】 The following are examples of the first limiting aspects of the first aspect: "A first embodiment of an article storage case, The aforementioned plurality of divided bottom plate sections are a pair of divided bottom plate sections obtained by dividing the inner case bottom plate section into two along the bottom plate section folding line, and the folded state of the bottom plate section is such that the inner case bottom plate section is folded downward in a valley fold shape along the bottom plate section folding line, in a case for storing articles. In other words, this is in the first aspect "The inner case bottom plate portion has a plurality of divided bottom plate portions divided along a bottom plate portion folding line that extends parallel to the first side of the pair of bottom plates, and is capable of changing between a basic state of the bottom plate portion that is a horizontal flat plate and a folded state of the bottom plate portion that is folded downward in a convex shape along the bottom plate portion folding line." "The inner case bottom plate portion has a pair of divided bottom plate portions that are divided along a bottom plate portion folding line that extends parallel to the first side of the pair of bottom plates, and is capable of changing between a basic state of the bottom plate portion that is a horizontal flat plate and a folded state of the bottom plate portion that is folded downward in a valley fold shape along the bottom plate portion folding line." It has been replaced with this. In this limited configuration, since there is only one pair (two) of divided bottom plates, the structure is simpler than when there are three or more. The second aspect is a further restricted version of this. 【0013】 The following are examples of the first aspect or a second aspect that limits the first aspect: "An article storage case in the first embodiment or its first limited embodiment, The plurality of divided side plate sections are a pair of divided side plate sections obtained by dividing the second side plate section of the inner case into two along the folding line of the second side plate section, and the folded state of the second side plate section is such that the second side plate section of the inner case is folded inward in a valley fold shape along the folding line of the second side plate section, in a case for storing articles. That is, in the first embodiment or its first limited embodiment "The pair of inner case second side plate portions have a plurality of divided side plate portions divided along a second side plate portion folding line extending in the height direction of the portion itself, and are capable of changing between a basic state of the second side plate portion being flat and a folded state of the second side plate portion being folded inward in a convex shape along the second side plate portion folding line." This has been replaced with: "The pair of inner case second side plate portions have a pair of divided side plate portions that are divided into two along a second side plate portion folding line that extends in the height direction of the portion itself, and can change between a basic state of the second side plate portion that is flat and a folded state of the second side plate portion that is folded inward in a valley fold shape along the second side plate portion folding line." In this limited configuration, since there is only one pair (two) of divided side panels, the structure is simpler than when there are three or more panels. The third aspect is a further restriction of this. 【0014】 A second aspect of the present invention is an article storage case according to the first aspect, wherein the plurality of divided bottom plate portions are a pair of divisions in which the inner case bottom plate portion is divided along the bottom plate portion folding line. Bottom plate part The case is an article storage case in which, in the folded state of the bottom plate, the bottom plate of the inner case is folded downward in a valley fold shape along the bottom plate folding line, and the two divided bottom plate sections extend almost vertically. 【0015】 In other words, this is in the first aspect "The inner case bottom plate portion has a plurality of divided bottom plate portions divided along a bottom plate portion folding line that extends parallel to the first side of the pair of bottom plates, and is capable of changing between a basic state of the bottom plate portion that is a horizontal flat plate and a folded state of the bottom plate portion that is folded downward in a convex shape along the bottom plate portion folding line." The inner case bottom plate portion has a pair of divided bottom plate portions that are divided along a bottom plate portion folding line extending parallel to the pair of first sides of the bottom plate, and can be transformed between a basic state of the bottom plate portion that forms a horizontal flat plate shape and a folded state of the bottom plate portion that is folded downward in a valley fold shape at the bottom plate portion folding line and the two divided bottom plate portions extend substantially vertically. It is replaced with the following. In this aspect, since there are a pair (two sheets) of divided bottom plate portions, the structure is simpler than in the case of three or more sheets. Also, since the two divided bottom plate portions extend substantially vertically, the two divided bottom plate portions will substantially overlap, and the folded state article storage case can be thinner than in other cases. 【0016】 A third aspect of the present invention is the article storage case of the first or second aspect, wherein the plurality of divided side plate portions are a pair of divided side plate portions obtained by dividing the second side plate portion of the inner case along a second side plate portion folding line, and the second side plate portion folding state is such that the second side plate portion of the inner case is folded inward in a valley fold shape at the second side plate portion folding line and the two divided side plate portions extend substantially along the pair of first side plate portions of the inner case. 【0017】 That is, this is the "The pair of second side plate portions of the inner case has a plurality of divided side plate portions divided along a second side plate portion folding line extending in its height direction, and can be transformed between a basic state of the second side plate portion that forms a flat plate shape and a folded state of the second side plate portion that is folded convexly inward at the second side plate portion folding line" in the first or second aspect is replaced with "The pair of second side plate portions of the inner case has a pair of divided side plate portions divided along a second side plate portion folding line extending in its height direction, and can be transformed between a basic state of the second side plate portion that forms a flat plate shape and a folded state of the second side plate portion that is folded inward in a valley fold shape at the second side plate portion folding line and the two divided side plate portions extend substantially along the pair of first side plate portions of the inner case". In this embodiment, since there is a pair (2) of divided side panels, the structure is simpler than when there are three or more panels. Furthermore, since both divided side panels extend almost along the pair of first side panels of the inner case, the two divided side panels almost overlap, and the folded item storage case can be thinner than in the case where they do not overlap. 【0018】 A fourth aspect of the present invention is an article storage case according to any of the first to third aspects, further comprising a lid, the lid having a rectangular lid body portion having a pair of lid first sides extending parallel to the pair of first sides of the bottom plate and a pair of lid second sides extending parallel to the pair of second sides of the bottom plate, the lid body portion being pivotable with respect to the upper edge of the outer case body or the inner case body at the pair of lid first sides, and comprising a plurality of divided lids divided along a lid folding line extending parallel to the pair of lid first sides, the lid being able to switch between a basic lid state that forms a horizontal flat plate shape and a folded lid state in which the lid is folded upward in a convex shape along the lid folding line, the basic inner case state further comprising the lid body portion being the basic lid state, and the folded inner case state further comprising the lid body portion being the folded lid state. 【0019】 The following effects and advantages can be obtained with this embodiment of the article storage case. The lid body is pivotable at the first side of the pair of lids relative to the upper edge of the outer case body or the inner case body, and can switch between a basic lid state that is a horizontal, flat plate shape and a folded lid state in which the lid is folded upward in a convex shape along the fold line. Furthermore, the inner case body can switch between a basic inner case state in which the pair of first inner case side plates are separated, the inner case bottom plate is in the basic bottom plate state (a horizontal, flat plate shape), the pair of second inner case side plates are in the basic second side plate state (a flat plate shape), and the lid body is in the basic lid state (a horizontal, flat plate shape), and a folded inner case state in which the pair of first inner case side plates are close together, the inner case bottom plate is in the bottom plate folded state (bent downwards in a convex shape along the bottom plate folding line), the pair of second inner case side plates are in the second side plate folded state (bent inwards in a convex shape along the second side plate folding line), and the lid body is in the folded lid state (bent upwards in a convex shape along the lid folding line). Furthermore, the outer case body is located outside the inner case body and does not hinder the phase change between the inner case body's basic state and its folded state. In conjunction with the phase change of the inner case body, it is possible to change between the outer case body's basic state (the state corresponding to the inner case body's basic state) and the outer case body's partially folded state (the state corresponding to the inner case body's folded state). 【0020】 Thus, in this item storage case, by manipulating a pair of second side plates of the inner case as needed, and changing the phase of the pair of first side plates of the inner case between a separated state and a close-proximity state, it is possible to change between the basic state (the inner case body is in the basic inner case state, the outer case body is in the basic outer case state, and the lid body is in the basic lid state) and the folded state (the inner case body is in the folded inner case state, the outer case body is in the roughly folded outer case state, and the lid body is in the folded state). Therefore, in this item storage case, even if the elements constituting the inner case body (inner case bottom plate, inner case first side plate, inner case second side plate) and the lid body are made of thick, heat-insulating plates, it is possible to easily switch between the basic state and the folded state. Thus, this storage case for goods can also be used for freezing and is easily foldable. 【0021】 A fifth aspect of the present invention is an article storage case according to the fourth aspect, wherein the plurality of divided lids are a pair of divided lids in which the lid body portion is divided into two along the lid folding line, and the folded state of the lid is such that the lid body portion is folded upward in a mountain fold shape. 【0022】 In other words, this is in the fourth aspect "The lid body portion has a plurality of divided lids that are divided along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a convex shape along the lid folding line." This has been replaced with: "The lid body portion has a pair of divided lids that are divided into two along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a mountain fold shape along the lid folding line." In this embodiment, since there is only one pair (two) of divided bottom plates, the structure is simpler than when there are three or more. 【0023】 The following are examples of limited embodiments that further restrict the fifth embodiment. "A fifth type of article storage case, The aforementioned folded lid is a case for storing articles, in which both divided lids extend almost vertically. In other words, this is in the fourth aspect "The lid body portion has a plurality of divided lids that are divided along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a convex shape along the lid folding line." This has been replaced with: "The lid body portion has a pair of divided lids that are divided into two along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the two divided lids are folded upward in a mountain fold shape along the lid folding line and extend almost vertically." In this limited configuration, since both lid sections extend almost vertically, they almost overlap, and as a result, the folded case containing the items can be thinner than in the other configuration. 【0024】 A sixth aspect of the present invention is an article storage case according to the fourth aspect, wherein the plurality of divided lids are a pair of first-side divided lids and a central-side divided lid, the lid body portion of which is divided along a plurality of lid folding lines, the pair of first-side divided lids include the pair of first sides of the lid, and the central-side divided lid is located between the pair of first-side divided lids. 【0025】 In other words, this is in the fourth aspect "The lid body portion has a plurality of divided lids that are divided along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a convex shape along the lid folding line." This has been replaced with: "The lid body portion has a pair of first-side divided lids and a central-side divided lid, which are divided along a plurality of lid folding lines that extend parallel to the pair of first sides of the lid, the pair of first-side divided lids include the pair of first sides of the lid, and the central-side divided lid is located between the pair of first-side divided lids, and is capable of changing between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a convex shape along the lid folding lines." In this embodiment, the divided bottom plate consists of three or more pieces, and the height of the lid body when folded may be lower than in the case of two divided pieces. Thus, the folded item storage case may be smaller. 【0026】 A seventh aspect of the present invention is an article storage case according to any of the first to sixth aspects, wherein the outer case body has an outer case bottom, a pair of outer case first sides, a pair of outer case second sides, and a pair of folding auxiliary parts, and the outer case bottom The inner case body corresponds to the inner case bottom plate portion, the pair of outer case first side portions correspond to the pair of inner case first side plate portions of the inner case body, the pair of outer case second side portions correspond to the pair of inner case second side plate portions of the inner case body, and the pair of folding assist portions correspond to the outer case bottom portion and the outside This is an article storage case that connects to the second side of the case, and as the inner case bottom plate attempts to change from the basic state of the bottom plate to the folded state of the bottom plate, the pair of divided bottom plate portions of the inner case bottom plate attempt to move in a direction having a vertical downward component, and are pulled downward based on pressing the bottom of the outer case downward, thereby extending in a direction having a vertical component between the pair of second side portions of the outer case and the bottom of the outer case, thereby extending the outer case body downward, and allowing the inner case bottom plate to change from the basic state of the bottom plate to the folded state of the bottom plate. 【0027】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage case of any of the first to sixth embodiments, the following effects and advantages are obtained. In this item storage case, the bottom of the outer case, a pair of first side parts of the outer case, and a pair of second side parts of the outer case correspond to the bottom plate of the inner case, a pair of first side plates of the inner case, and a pair of second side plates of the inner case, respectively. However, this alone is insufficient for the outer case to change between the basic state of the outer case and the partially folded state of the outer case in accordance with the phase change between the basic state of the inner case and the folded state of the inner case. Here, in this item storage case, the outer case body is the bottom of the outer case and outside It has a folding assist part that connects to the second side of the case, and performs the following function. As the inner case bottom plate attempts to change from its basic state to a folded state, the pair of divided side plates of the inner case bottom plate attempt to move in a direction having a vertically downward component. Based on the downward pressure exerted by these divided bottom plates on the outer case bottom, the folding assist portion is pulled downward, extending in a direction having a vertical component between the pair of second outer case sides and the outer case bottom, causing the outer case body to extend downward. In this way, the folding support part allows the inner case bottom plate to change from its basic bottom plate state to a folded bottom plate state. In this way, in this item storage case, the outer case body changes from the basic outer case state to the partially folded outer case state, following the inner case body's transformation from the basic inner case state to the folded inner case state. Thus, the effects and advantages of any of the first to sixth embodiments of the article storage case can be obtained more concretely with this article storage case. 【0028】 An eighth aspect of the present invention is an article storage case according to the seventh aspect, wherein the pair of folding auxiliary parts are formed by combining bottom-side auxiliary part forming parts formed in series with the bottom of the outer case by a sheet forming the bottom of the outer case, and second-side auxiliary part forming parts formed in series with the second side of the outer case by a sheet forming the second side of the outer case. 【0029】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage case of the seventh embodiment, the following effects and advantages are obtained. In this item storage case, a pair of folding auxiliary parts are formed by combining a bottom-side auxiliary part forming part, which is formed by a sheet forming the bottom of the outer case, and a second-side auxiliary part forming part, which is formed by a sheet forming the second side of the outer case. As a result, in each folding auxiliary part, the relative positional relationship between the bottom-side auxiliary part forming part and the second-side auxiliary part forming part changes, which in turn changes the relative positional relationship between the bottom of the outer case and the second side of the outer case. Therefore, as described above, as the inner case bottom plate attempts to change from its basic bottom plate state to a folded bottom plate state, the outer case bottom is pressed downward by the pair of divided bottom plate sections of the inner case bottom plate, the folding assist section is pulled downward, and the folding assist section becomes able to extend in a direction having a vertical component between the outer case bottom and the pair of second outer case sides, thereby enabling the outer case body to extend downward. Thus, the effects and advantages of the seventh embodiment of the article storage case can be obtained more concretely with this article storage case. 【0030】 A ninth aspect of the present invention is an article storage case according to the eighth aspect, wherein the bottom auxiliary part forming portion extends toward its tip with the boundary portion with the bottom of the outer case as its base edge, the second side auxiliary part forming portion extends toward its tip with the boundary portion with the second side of the outer case corresponding to the bottom auxiliary part forming portion, and the folding auxiliary part is formed by joining the portion of the bottom auxiliary part forming portion other than the base edge and the portion of the second side auxiliary part forming portion other than the base edge. 【0031】 The phrase "The folding auxiliary portion is formed by joining the portion of the bottom auxiliary portion forming part other than the base edge and the portion of the second side auxiliary portion forming part other than the base edge" can also be expressed as "The folding auxiliary portion is formed by joining the edge portion of the bottom auxiliary portion forming part other than the base edge and the edge portion of the second side auxiliary portion forming part other than the base edge." 【0032】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage case of the eighth embodiment, the following effects and advantages are obtained. In this item storage case, in each folding support section, the bottom support section forming section and the second side support section forming section are not connected at their base edges. Therefore, as described above, as the inner case bottom plate attempts to change from its basic bottom plate state to a folded bottom plate state, the outer case bottom is pressed downward by the pair of divided bottom plate sections of the inner case bottom plate, and as a result the folding assist section is pulled downward, the bottom assist section forming section and the second side assist section forming section of the folding assist section can separate from each other based on their respective base edges. In this way, the folding support portion can extend in a direction having a vertical component between the pair of second side portions of the outer case and the bottom portion of the outer case, allowing the outer case body to extend downward. Thus, the effects and advantages of the eighth embodiment of the article storage case can be obtained more concretely with this article storage case. 【0033】 A tenth aspect of the present invention is an article storage case according to the ninth aspect, wherein the bottom auxiliary part forming portion has a base edge portion at the boundary with the bottom of the outer case and gradually narrows in width towards its own front end, and the second side auxiliary part forming portion corresponds to the bottom auxiliary part forming portion and has a base edge portion at the boundary with the second side of the outer case and gradually narrows in width towards its own front end. 【0034】 Shapes that gradually narrow towards their tip include isosceles triangles, trapezoids, and semicircles. An isosceles triangle shape can also be described as a right-angled isosceles triangle. 【0035】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage case of the ninth embodiment, the following effects and advantages are obtained. In this item storage case, the bottom auxiliary forming section and the second side auxiliary forming section each have a shape that gradually narrows in width towards the tip, with the boundary portion with the bottom of the outer case and the second side of the outer case respectively serving as the base edge. Therefore, each folding auxiliary section gradually narrows in width from its base edge towards the tip. Therefore, as described above, when the inner case bottom plate attempts to change phase from the basic bottom plate state to the folded bottom plate state, the folding auxiliary part attempts to change phase as the bottom auxiliary part forming part and the second side auxiliary part forming part separate from each other with respect to its base edge. At this time, the tip side of the folding auxiliary part is prevented from resisting the phase change, and the outer case body can smoothly change phase from the basic outer case state to the folded outer case state. In this way, this item storage case can more smoothly transform from its basic state to its folded state. 【0036】 An eleventh aspect of the present invention is an article storage case according to the ninth or tenth aspect, wherein in the folding auxiliary portion, the vicinity of the center of the bottom auxiliary portion forming portion and the vicinity of the center of the second side auxiliary portion forming portion are joined to form a joint portion, and when the inner case body is in the folded state, the portion of the bottom auxiliary portion forming portion closer to the base edge than the joint portion and the portion of the second side auxiliary portion forming portion closer to the base edge than the joint portion are in a substantially vertical state continuous with the second side of the outer case. 【0037】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage case of the ninth or tenth embodiment, the following effects and advantages are obtained. In this item storage case, the folding support portion is further formed by joining the central vicinity of the bottom support portion forming portion and the second side support portion forming portion. When the inner case body is in the folded state, both the bottom support portion forming portion and the second side support portion forming portion are in a nearly vertical state, with the portion closer to their base edge than the joining portion being continuous with the second side of the outer case. In other words, the fact that both the bottom-side auxiliary part forming portion and the second-side auxiliary part forming portion have portions closer to their own base edge than the connecting portion that are continuous with the second side of the outer case and are almost vertical means that the folding auxiliary part is extended to its maximum extent in the vertical direction. The fact that the connecting portion is formed in such a position means that, within the range in which the inner case body can transform into the inner case folded state, the connecting portion is formed at the position closest to the base edge of the folding auxiliary part. Therefore, in the folding support section, the bottom support section forming section and the second side support section forming section are prevented from being separated too much, the folding support section is prevented from changing shape irregularly, the outer case body changes shape smoothly, and consequently, the article storage case can change shape smoothly. 【0038】 A twelfth aspect of the present invention is an article storage case according to any seventh to eleventh aspect, wherein each folding auxiliary part is detachably coupled to each second side of the outer case when the article storage case is in the basic state. 【0039】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage cases of embodiments 7 to 11, the following effects and advantages are obtained. In this item storage case, the folding support section is detachably attached to the second side of each outer case when in its basic state, thus ensuring compactness even in the basic state and preventing the folding support section from getting in the way when storing and transporting items. 【0040】 A thirteenth aspect of the present invention is an article storage case according to any seventh to twelfth aspect, wherein the outer case body is provided with a belt that irremovably and detachably connects the pair of first outer case sides to each other when the article storage case is in the folded state. 【0041】 In this embodiment of the article storage case, in addition to the effects and advantages of the article storage cases of embodiments 7 to 12, the following effects and advantages are obtained. In this item storage case, when folded, a pair of outer case first sides are inseparably connected by a belt. In this way, the folded state of this item storage case is properly maintained. [Brief explanation of the drawing] 【0042】 [Figure 1A] This is a perspective view showing the article storage case (basic state) of Embodiment 1 of the present invention (showing the lid in the closed position). (a) and (b) are views from different angles (both obliquely from above). [Figure 1B] This is a perspective view showing the article storage case (basic state) of Embodiment 1 of the present invention (showing the lid in the open position). (a) is a view from diagonally above, and (b) is a view from diagonally below. [Figure 2A] This is an exploded perspective view showing the article storage case (basic state) of Embodiment 1 of the present invention. [Figure 2B] This is an exploded perspective view showing the article storage case of Embodiment 1 of the present invention (a state between the basic state and the folded state). [Figure 2C] This is an exploded perspective view showing the article storage case (folded state) of Embodiment 1 of the present invention. [Figure 3] This is an exploded perspective view showing the inner case body of the article storage case according to Embodiment 1 of the present invention. [Figure 4] This is an exploded perspective view showing the outer case body of the article storage case according to Embodiment 1 of the present invention. [Figure 5A] This is a perspective view showing the method of using the article storage case of Embodiment 1 of the present invention (transformation from the basic state to the folded state). The first step is shown. Of the first steps, (2) shows the next step after (1). [Figure 5B] This is a perspective view showing the method of using the article storage case of Embodiment 1 of the present invention (transition from the basic state to the folded state). Figure 5A shows the next step. (b) is a perspective view from a different direction than (a). [Figure 5C]This is a perspective view showing the method of using the article storage case of Embodiment 1 of the present invention (transition from the basic state to the folded state). The final stage is shown. [Figure 6] This is a longitudinal cross-sectional view showing the method of use (transformation from the basic state to the folded state) of the article storage case according to Embodiment 1 of the present invention. This is a virtual cut along a vertical plane extending in the width direction of the article storage case. (A) to (C) correspond to Figures 5A to 5C, respectively. [Figure 7] This is a longitudinal cross-sectional view showing the method of use (transformation from the basic state to the folded state) of the article storage case according to Embodiment 1 of the present invention. This is a virtual cut along a vertical plane extending in the depth direction of the article storage case. (A) to (C) correspond to Figures 5A to 5C, respectively. [Figure 8A] This is a perspective view showing the article storage case (basic state) of Embodiment 2 of the present invention (showing the lid in the closed position). (a) and (b) are views from different angles (both obliquely from above). [Figure 8B] A perspective view showing an article storage case according to Embodiment 2 of the present invention (showing the inner and outer case bodies in their basic state and the lid in the open position). (a) is a view from diagonally above, and (b) is a view from diagonally below. [Figure 9A] This is an exploded perspective view showing the article storage case (basic state) of Embodiment 2 of the present invention. [Figure 9B] This is an exploded perspective view showing the article storage case of Embodiment 2 of the present invention (a state between the basic state and the folded state). [Figure 9C] This is an exploded perspective view showing the article storage case (folded state) of Embodiment 2 of the present invention. [Figure 10] This is an exploded perspective view showing the inner case body and lid of the article storage case according to Embodiment 2 of the present invention. [Figure 11A] This is a perspective view showing the method of using the article storage case of Embodiment 2 of the present invention (transition from the basic state to the folded state). The first step is shown. [Figure 11B]This is a perspective view showing the method of using the article storage case of Embodiment 2 of the present invention (transition from the basic state to the folded state). It shows the next step after Figure 11A. [Figure 11C] This is a perspective view showing the method of using the article storage case of Embodiment 2 of the present invention (transition from the basic state to the folded state). The final stage is shown. [Figure 12] This is a longitudinal cross-sectional view showing the method of use (transformation from the basic state to the folded state) of the article storage case according to Embodiment 2 of the present invention. This is a virtual cut along a vertical plane extending in the depth direction of the article storage case. (A) to (C) correspond to Figures 11A to 11C, respectively. [Figure 13] This is an exploded perspective view showing the article storage case of Embodiment 3 of the present invention (a state between the basic state and the folded state). This figure corresponds to Figure 9B of Embodiment 2. [Figure 14] This is a perspective view showing the folded state of the article storage case according to Embodiment 3 of the present invention. This figure corresponds to Figure 11C of Embodiment 2. [Modes for carrying out the invention] 【0043】 [Example 1] Next, an article storage case, which is Embodiment 1 of the present invention, will be described with reference to Figures 1 to 7. As shown in Figures 2A to 2C, this article storage case is a double-layered case having an inner case body 10 and an outer case body 30, as well as a lid 60. Furthermore, this item storage case can change between a basic rectangular parallelepiped shape (Figure 1A) and a folded state (Figure 5C). 【0044】 The "basic state" of this item storage case is the state in which the inner case body 10 is in a basic state of being rectangular parallelepiped shape (inner case basic state), as shown in Figures 1A to 2A, 5A, 6(A), and 7(A), and the outer case body 30 is also in a basic state of being rectangular parallelepiped shape (outer case basic state). Similarly, the "folded state" refers to the state in which the inner case body 10 is in a folded state (inner case folded state), as shown in Figures 2C, 5C, 6(C), and 7(C), and the outer case body 30 is in a nearly folded state corresponding to the folded inner case body 10. The lid 60 is openable and closable, and can be displaced between a closed position (Figure 1A) and an inverted position (Figure 5C). This description of the item storage case will be based on its position when placed on a horizontal surface. 【0045】 As shown in Figures 2A to 3, the inner case body 10 has an inner case bottom plate portion 12, a pair of inner case first side plate portions 14, and a pair of inner case second side plate portions 16. As shown in Figures 1B(a) and 2A, the inner case body 10 has a rectangular parallelepiped shape with an open top when the article storage case is in its basic state (the inner case body 10 is in the basic inner case state). The inner case body 10 is housed inside the outer case body 30 and is detachably fixed to the outer case body 30. 【0046】 As shown in Figures 1A to 2C and Figure 4, the outer case body 30 has an outer case bottom 32 (Figure 1B(b), Figure 4), a pair of outer case first side parts 34, a pair of outer case second side parts 36, and a pair of folding auxiliary parts 50. As shown in Figures 1B and 2A, when the article storage case is in its basic state (the outer case body 30 is in its basic outer case state), the outer case body 30 has a rectangular parallelepiped shape with an open top, and a pair of folding auxiliary parts 50 attached to its lower end. 【0047】 As shown in Figures 2A to 2C, the lid 60 has a main body 61, a mounting piece 62, and a folding piece 65. As shown in Figures 1A to 2C, the lid 60 is detachably connected to the outer case body 30 at the mounting piece 62 (Figures 2A to 2C) (Figures 1A and 1B). 【0048】 First, the inner case body 10 will be explained in detail based on Figures 2A to 3, Figure 7, etc. As mentioned above, the inner case body 10 has an inner case bottom plate portion 12 (Figures 2A and 3), a pair of inner case first side plate portions 14, and a pair of inner case second side plate portions 16, all of which are in the form of thick plates. In other words, both are formed by covering a thick plate-shaped insulating material with a sheet-like cover made of synthetic resin. 【0049】 As also mentioned above, the inner case body 10 can change between a basic state (inner case basic state) (Figure 2A, Figure 7(A)) and a folded state (inner case folded state) (Figure 2C, Figure 7(C)). The "basic state (basic inner case state)" of the inner case body 10 is a state in which, as shown in Figures 2A and 7(A), the pair of first inner case side plate sections 14 are separated (first side wall section separated state), and both the inner case bottom plate section 12 and the inner case second side plate section 16 are in the basic state (bottom plate section basic state and second side plate section basic state). Similarly, the "folded state (folded inner case state)" refers to a state in which, as shown in Figures 2C and 7(C), the pair of first inner case side plates 14 are in close proximity (first side wall close proximity state), and both the inner case bottom plate 12 and the inner case second side plate 16 are in a folded state (bottom plate folded state and second side plate folded state). 【0050】 The inner case bottom plate portion 12 has a horizontal rectangular shape in its basic state (Figure 2A) and the inner case body 10, and both have a pair of long sides (first side of the bottom plate) and short sides (second side of the bottom plate). As mentioned above, both the pair of inner case first side plate portions 14 and inner case second side plate portions 16 of the inner case body 10 are in the shape of thick plates. The long side (first side of the bottom plate) of the inner case bottom plate portion 12 is the same size as the long side (width) of the inner case first side plate portion 14, and the short side (second side of the bottom plate) of the inner case bottom plate portion 12 is the same size as the short side (width) of the inner case second side plate portion 12. 【0051】 As shown in Figures 2A to 3, the inner case bottom plate portion 12 has a pair of divided bottom plate portions 13 that are divided along a folding line (bottom plate folding line) 11. The bottom plate folding line 11 connects the centers of the two short sides of the inner case bottom plate portion 12 and extends in the direction of the long side of the inner case bottom plate portion 12. The two divided bottom plate sections 13 are connected so that they can be folded downwards in a valley-fold shape. In other words, the two divided bottom plate portions 13 are connected to each other so as to be able to swing (rotate) at the upper edges of the opposing end faces of the two divided bottom plate portions 13. 【0052】 More precisely, the bottom plate fold line 11 is the part that connects the upper edges of the bottom plate, and the inner case bottom plate 12 is divided into a pair of divided bottom plate sections 13 by the surface including the bottom plate fold line 11. The two divided bottom plate sections 13 are connected so that they can be folded downward in a valley fold shape along the bottom plate fold line 11. Therefore, the inner case bottom plate portion 12 can be folded downward in a valley fold shape along the bottom plate folding line 11. 【0053】 Thus, the inner case bottom plate portion 12 can change between the basic state (Figure 2A, Figure 7(A)) and the folded state (Figure 2C, Figure 7(C)). The "basic state (basic state of the bottom plate)" of the inner case bottom plate portion 12 is, as shown in Figures 2A and 7(A), a single flat plate that extends perpendicularly and horizontally to both inner case first side plate portions 14. Similarly, the "folded state (folded state of the bottom plate)" refers to a state in which, as shown in Figures 2C and 7(C), each divided bottom plate portion 13 extends vertically downward (hangs down) from the corresponding first side plate portion 14 of the inner case, and the two divided bottom plate portions 13 overlap each other. Furthermore, each divided bottom plate section 13 extends almost vertically, and there are cases where the two divided bottom plate sections 13 are close to each other but do not overlap (do not make surface contact). 【0054】 As shown in Figures 2A and 3, each inner case first side plate portion 14 corresponds to each long side of the inner case bottom plate portion 12 and has a vertical rectangular shape. In other words, each inner case first side plate portion 14 extends in the width direction of the article storage case and also extends vertically, and each has a pair of horizontal long sides (sides in the width direction) and vertical short sides (sides in the height direction). As mentioned above, the long side of each inner case's first side plate portion 14 (the widthwise side of this item storage case) is the same size as the long side of the inner case's bottom plate portion 12. 【0055】 Each inner case first side plate portion 14 is connected at the inner edge of its lower edge (lower long side) to the lower edge of the long side of the inner case bottom plate portion 12 (the outer edge of the divided bottom plate portion 13 on the side of the inner case first side plate portion 14) so ​​as to be able to swing (rotate) relative to it. 【0056】 In detail, it is as follows: As shown in Figure 3, stitching allowances 22 are formed on the edges of each long side of the inner case bottom plate portion 12. Each stitching allowance portion 22 is a flexible, narrow sheet-like structure and extends from the lower edge of each long side of the inner case bottom plate portion 12 (basic state). As mentioned above, the bottom of the inner case is formed by covering a thick plate-shaped insulating material with a sheet-like cover made of synthetic resin, and each stitching allowance portion 22 is integrally formed with the inner case bottom plate portion 12 by its cover. Each stitching allowance 22 is joined by stitching to the end face (its outer edge and inner edge) that forms the lower edge of each inner case first side plate portion 14. Thus, the inner case bottom plate portion 12 is pivotable (rotatable) at each of its long sides (lower edges) relative to the lower edge portion (inner edge) of each inner case first side plate portion 14. 【0057】 Thus, as shown in Figures 2A to 2C and Figure 7, as the pair of inner case first side plate portions 14 change phases between a separated state (Figure 2A, Figure 7(A)) and a close-proximity state (Figure 2C, Figure 7(C)), the inner case bottom plate portion 12 changes phases between the basic state (Figure 2A) and the folded state (Figure 2C), as described above. The "separated state (first side plate separation state)" of the pair of inner case first side plate portions 14 is the state in which both inner case first side plate portions 14 are separated from each other to the greatest extent, as shown in Figures 2A and 7(A). Similarly, the "proximity state (proximity state of the first side plate portion)" refers to the state in which the first side plate portions 14 of both inner cases are in the closest proximity to each other, as shown in Figures 2C and 7(C). 【0058】 As shown in Figure 2A, in the basic state, the inner case bottom plate portion 12 is located inside the two inner case first side plate portions 14 in the separated state, and the lower surface of the inner case bottom plate portion 12 in the basic state and the end surfaces that form the lower edges (lower long sides) of the two inner case first side plate portions 14 are flush. 【0059】 As shown in Figure 2A, each inner case second side plate portion 16 corresponds to the short sides of the inner case bottom plate portion 12 in the basic state of itself and the inner case body 10, and has a vertical rectangular shape. Each inner case second side plate portion 16 extends in the depth direction of the article storage case and also extends vertically in the basic state of itself and the inner case body 10, and each has a pair of horizontal short sides (sides in the width direction of itself) and vertical long sides (sides in the height direction). 【0060】 As mentioned above, the short side of each inner case's second side plate portion 16 (the side in the depth direction of this item storage case) is the same size as the short side of the inner case's bottom plate portion 12. The longer side (the side in the height direction of this article storage case) of each inner case's second side plate portion 16 has a dimension obtained by subtracting the thickness of the inner case's bottom plate portion 12 from the dimension of the shorter side (similarly the side in the height direction of this article storage case) of the first side wall portion. Thus, as shown in Figure 2A, the upper edge (upper short side) of each inner case second side plate 16 is at the same height as the upper edge (upper long side) of each inner case first side plate 14. The lower edge (lower short side) of each inner case second side plate 16 is higher than the lower edge (lower long side) of each inner case first side plate 14 by the thickness of the inner case bottom plate 12. 【0061】 As shown in Figures 2A to 3, the second side panel 16 of the inner case has a pair of divided side panel sections 17 that are divided along a folding line (second side panel folding line) 15. The second side panel folding line 15 connects the centers of the two short sides of the second side panel 16 of the inner case and extends in the direction of the long side of the second side panel 16 of the inner case (the height direction of this article storage case). The two divided side plate sections 17 are connected in such a way that they can be folded inward (towards each other) in a valley-fold shape. In other words, the two divided side plate portions 17 of the inner case second side plate portion 16 are connected to each other so as to be able to swing (rotate) at the outer edges of the end faces that form the edges of the two divided side plate portions 17 that are opposite to each other. 【0062】 More precisely, the second side plate fold line 15 is the portion that connects the outer edges of the two side plates, and the inner case second side plate 16 is divided into a pair of divided side plate sections 17 by the surface including the second side plate fold line 15. The two divided side plate sections 17 are connected at the second side plate fold line 15 so that they can be folded inward in a valley fold shape. Therefore, the second side plate portion 16 of the inner case can be folded inward in a valley fold shape along the second side plate portion folding line 15. 【0063】 Thus, each inner case's second side plate portion 16 can change between a basic state (Figure 2A) and a folded state (Figure 2C). The "basic state (basic state of the second side panel)" of the inner case second side panel 16 is, as shown in Figures 2A and 7(A), a single flat plate formed by both divided side panel sections 17, and is perpendicular to both inner case first side panel sections 14. Similarly, the "folded state (folded state of the second side plate)" is a state in which both divided side plate portions 17 extend inward parallel to both inner case first side plate portions 14, and both inner case first side plate portions overlap each other between the two inner case first side plate portions 14, extending along both inner case first side plate portions 14. In addition, both divided side plate portions 17 extend inward almost parallel to both inner case first side plate portions 14, and in some cases, the two inner case first side plate portions are close to each other but do not overlap (do not make surface contact) between the two inner case first side plate portions 14, and extend almost along the two inner case first side plate portions 14. In all cases, the "bent state (bent state of the second side plate)" described above refers to the inner case body 10 as a standalone unit. As shown in Figure 5C, when combined with the outer case body 30, considering the second side portion 36 of the outer case, the degree of bending is slightly less than described above. However, this is a minor detail and will be ignored in this discussion. The same applies to the impact of this on other elements of the inner case body 10. 【0064】 As shown in Figure 2A, in the basic state, each second side plate portion 16 of the inner case corresponds to each short side of the inner case bottom plate portion 12 (as mentioned above) and is located on the inner case bottom plate portion 12, but each second side plate portion 16 of the inner case is not connected to the inner case bottom plate portion 12. 【0065】 As shown in Figures 2A to 3, each inner case second side plate portion 16 is connected to the inner edge of each side edge portion (each long side) of each inner case first side plate portion 14 in a manner that allows it to swing (rotate) relative to the vicinity of each short side of the inner surface. Thus, as shown in Figures 2A to 2C and Figure 7, the second side plate portion 16 of the inner case changes between its basic state and a folded state as the first side plate portions 14 of the inner case move apart and closer together. 【0066】 In detail, it is as follows: As shown in Figure 3, each inner case second side plate portion 16 has a stitching allowance portion 26 formed on each side edge (each long side). Each stitching allowance portion 26 is a flexible, narrow sheet-like structure and extends from the inner edge of the end face of each long side of the inner case second side plate portion 16 (basic state). As described above, each inner case second side plate portion 16 is formed by covering a thick plate-shaped insulating material with a sheet-like cover made of synthetic resin, and each stitching allowance portion 26 is integrally formed with the inner case second side plate portion 16 by its cover. Each stitching allowance 26 has a width equal to the thickness of each inner case second side plate portion 16 and is joined by stitching to the vicinity of each short side of the inner surface of each inner case first side plate portion 14. The leading edge of each stitching allowance 26 is located on each short side of the inner surface of each inner case first side plate portion 14. 【0067】 Thus, as shown in Figures 2A to 2C and Figure 7, the first side plate portions 14 of both inner cases change phases between a separated state (Figure 2A, Figure 7(A)) and a close-proximity state (Figure 2C, Figure 7(C)), and as described above, each second side plate portion 16 of the inner case can change phases between a basic state (Figure 2A, Figure 7(A)) and a folded state (Figure 2C, Figure 7(C)). As shown in Figure 2A, in the basic state, each second side plate portion 16 of the inner case is located inside the first side plate portions 14 of both inner cases in the separated state, and the outer surface of each second side plate portion 16 of the inner case in the basic state and the end faces that form each side edge (each short side) of the first side plate portions 14 of both inner cases are flush with each other. 【0068】 As shown in Figures 2A to 3, a pair of bottom plate thickness covering portions 18 are formed on the lower edge of each inner case second side plate portion 16 (and its pair of divided side plate portions 17). Each bottom plate section's thick covering portion 18 is sheet-like and flexible. As described above, each inner case second side plate portion 16 is formed by covering a thick plate-shaped insulating material with a synthetic resin sheet-like cover, while each bottom plate thick covering portion 18 is integrally formed with the inner case second side plate portion 16 by its cover. 【0069】 Each bottom plate thickness covering portion 18 extends downward from the outer edge (its entire length) of the end face forming the lower edge of each divided side plate portion 17, by a length equal to the thickness of the inner case bottom plate portion 12. The pair of bottom plate thickness covering portions 18 are not directly connected to each other. Each bottom plate section thick covering portion 18 is sheet-like and flexible (as described above), and normally extends vertically downward in a continuous manner with the outer surface of each inner case second side plate section 16 (each divided side plate section 17). Each bottom plate section thick covering portion 18 is elastically capable of changing its position to one that extends horizontally outward perpendicular to the outer surface of each inner case second side plate section 16 (each divided side plate section 17) (and even beyond that to one that extends vertically upward). 【0070】 Thus, as shown in Figure 2A, in the basic state of the inner case body 10, each inner case second side plate portion 16 is in the shape of a single plate and is located on the inner case bottom plate portion 12 at each short side of the inner case bottom plate portion 12 and in its vicinity (corresponding to the thickness of the inner case second side plate portion 16), and each bottom plate thickness covering portion 18 is located on the outside of each short side of the inner case bottom plate portion 12, extends vertically downward, and covers the end face of the short side. In this way, the airtightness inside the inner case body 10 is enhanced. Then, as shown in Figure 2A → Figure 2B, when the inner case body 10 (each inner case second side plate portion 16) changes phase toward a folded state, each bottom plate thick covering portion 18 comes into contact with the inner case bottom plate portion 12, and elastically changes phase from the vertical state as appropriate. The same applies in the reverse case; as shown in Figure 2B → Figure 2A, when the inner case body 10 (each inner case second side plate portion 16) returns to its basic state, each bottom plate thickness covering portion 18 returns to a vertical position outside the short side of the inner case bottom plate portion 12. 【0071】 As detailed above, by changing the phase between a separated state (Figures 2A, 7(A)) and a close-proximity state (Figures 2C, 7(C)) for both inner case first side plate portions 14, the inner case body 10 can be changed between a basic state (Figures 2A, 7(A)) and a folded state (Figures 2C, 7(C)). 【0072】 Furthermore, when attempting to change the inner case body 10 from its basic state (Figure 2A) to its folded state (Figure 2C), as shown by the solid arrows in Figure 2A, the change can be made smoothly by first artificially slightly changing the phase of both inner case second side plates 16 toward the folded state, and then attempting to change the phase of both inner case first side plates 14 toward the close-proximity state. Similarly, when attempting to change the inner case body 10 from a folded state (Figure 2C) to a basic state (Figure 2A), the change can be made smoother by first changing the phase of both inner case first side plates 14 toward a separated state so that the inner case body 10 (both inner case second side plates 16) is close to the basic state, and then artificially slightly changing the phase of both inner case second side plates 16 toward the basic state, as shown by the dashed arrows in Figure 2A. 【0073】 Next, the outer casing 30 will be described in detail based on Figures 1A to 2C, 4, 7, etc. As described above, the outer case body 30 has an outer case bottom 32 (Figure 1B(b), Figure 4), a pair of outer case first side parts 34, a pair of outer case second side parts 36, and a pair of folding assist parts 50. All of these are formed from sheets of synthetic resin and are flexible, and the angles of the boundary portions of each of these elements are also variable. As shown in Figures 2A to 2C, the outer case bottom 32, the pair of outer case first side portions 34, and the pair of outer case second side portions 36 of the outer case body 30 correspond to the inner case bottom plate portion 12, the pair of inner case first side plate portions 14, and the pair of inner case second side plate portions 16 of the inner case body 10, respectively. 【0074】 As also mentioned above, the outer case body 30 can change between a basic state (outer case basic state) (Figure 2A, Figure 7(A)) and a nearly folded state (outer case nearly folded state) (Figure 2C, Figure 7(C)). As shown in Figures 2A and 7(A), the basic state of the outer case 30 (outer case basic state) corresponds to the basic state of the inner case 10 (inner case basic state). As shown in Figures 2C and 7(C), the nearly folded state of the outer case 30 (outer case nearly folded state) corresponds to the folded state of the inner case 10 (inner case folded state). 【0075】 As mentioned above, the outer case body 30 is flexible and can take on various shapes other than its basic state. However, when the inner case body 10 is housed inside the outer case body 30, if the inner case body 10 is in a folded state, the outer case body 30 will be in a correspondingly folded state. Then, in accordance with the inner case body 10 changing between its basic state and its folded state, the outer case body 30 also changes between its basic state and its nearly folded state. This is the relationship between them. 【0076】 The "basic state (basic state of the outer case)" of the outer case body 30 is a state in which, as shown in Figures 2A and 7(A), the pair of first outer case sides 34 are separated (first side separated state), and both the outer case bottom 32 and the second outer case side 36 are in a basic state (bottom basic state and second side basic state). The "separated state (first side separation state)" of the pair of first outer case sides 34 refers to the state in which the two first outer case sides 34 are separated from each other to their greatest extent. The "basic state (basic state of the bottom) and the second side of the outer case (basic state of the second side)" of the bottom 32 and the second side of the outer case (basic state of the second side) are both states in a planar, natural state. 【0077】 The "approximately folded state (approximately folded state of the outer case)" of the outer case body 30 is the state shown in Figures 2C and 7(C), as follows. The pair of outer case first side portions 34 are in a state where they are quite close to each other, corresponding to the two inner case first side plate portions 14 which are in close proximity. The bottom portion 32 of the outer case is folded in a roughly valley-fold shape, corresponding to the folded bottom plate portion 12 of the inner case (Figure 7(C)). The outer case's second side portion 36, together with the folding assist portion 50 which is almost vertical, is in a folded state corresponding to the folded state of the inner case's second side plate portion 16. 【0078】 As shown in Figures 1B(b) and 4, the bottom portion 32 of the outer case is a horizontal rectangle in its basic state (Figure 2A) with the outer case body 30, and both have a pair of long and short sides. As shown in Figures 1A to 2A and Figure 4, each first side portion 34 of the outer case corresponds to each long side of the bottom portion 32 of the outer case (Figure 4), and in its basic state (Figure 2A), it has a vertical rectangular shape. Similarly, as shown in Figures 1A to 2A and 4, each second side portion 36 of the outer case corresponds to each short side of the bottom portion 32 of the outer case (Figure 4), and in its basic state (Figure 2A), it has a vertical rectangular shape. 【0079】 As shown in Figure 4, the bottom portion 32 of the outer case is formed by a flexible sheet 31 for the bottom portion of the outer case. The pair of second side portions 36 of the outer case are formed by a pair of flexible sheets 35 for the second side portions of the outer case. The pair of folding support sections 50 are formed by the sheet 31 for the bottom of the outer case and the pair of sheets 35 for the second sides of the outer case as described above. 【0080】 The sheet 31 for the bottom of the outer case has a rectangular base in its planar, natural state and has a pair of long sides (reference numerals omitted). These long sides correspond to the width direction of the article storage case. The rectangular portion forms the bottom 32 of the outer case. 【0081】 Bottom-side auxiliary part forming portions 52 are formed at both ends of the outer case bottom sheet 31 (corresponding to the pair of short sides of the outer case bottom sheet 31). The bottom auxiliary forming portion 52 is shaped like a right-angled isosceles triangle and has a pair of hypotenuses (symbol omitted). 【0082】 Each first side portion 34 of the outer case corresponds to the long sides of the bottom portion 32 of the outer case and has a vertical rectangular shape. In other words, each outer case first side portion 34, in its planar natural state, extends in the width direction of the article storage case and also extends vertically, and each has a pair of horizontal long sides and vertical short sides. As shown in Figures 2A and 4, each outer case first side portion 34 is joined to each long side of the outer case bottom portion 32 (each long side of the outer case bottom sheet 31) by sewing at its lower edge (lower long side). 【0083】 Each outer case's second side sheet 35 has a rectangular base in its planar, natural state and has a pair of long sides (reference numerals omitted). These long sides correspond to the height direction of the article storage case. The rectangular portion forms the second side portion 36 of the outer case. Furthermore, the second side portion 36 of the outer case and the bottom portion 32 of the outer case are not directly connected. 【0084】 A second side auxiliary part forming portion 56 is formed at the lower end of each outer case second side sheet 35 (corresponding to the lower short side of the outer case second side 36). The second side auxiliary forming portion 56 corresponds to the bottom auxiliary forming portion 52. The second side auxiliary forming portion 56 also has the shape of a right-angled isosceles triangle and has a pair of hypotenuses (notation omitted). 【0085】 As shown in Figures 2A and 4, each outer case first side portion 34 and each outer case second side portion sheet 35 (the portion that forms the outer case second side portion 36) are joined together by stitching at their respective side edges. 【0086】 Each folding support portion 50 (Figure 2A, etc.) is formed by the bottom support portion forming portion 52 of the bottom sheet 31 for the bottom of the outer case and the second side support portion forming portion 56 of the second side sheet 35 for the second side of the outer case, as shown in Figure 4. In other words, each bottom-side auxiliary part forming section 52 and each second side-side auxiliary part forming section 56 are in the shape of a right-angled isosceles triangle that corresponds to each other (as mentioned above), and each folding auxiliary part 50 is formed by sewing together their hypotenuses (or more precisely, their vicinity). Thus, as shown in Figure 2A and other figures, each folding support part 50 is shaped like a right-angled isosceles triangle, and has a sewing joint part 54 on one of its hypotenuses (or more precisely, in its vicinity). In this way, each folding support part 50 connects the bottom part 32 of the outer case to each second side part 36 of the outer case. In each folding support section 50, an internal space is formed by the bottom support section forming section 52 and the second side support section forming section 56 in predetermined cases. 【0087】 Furthermore, in each folding support section 50, the central areas of each bottom support section forming section 52 and each second side support section forming section 56 are joined together. Thus, each folding support section 50 has a sewn-on joining section 55 (joining section) near its center. 【0088】 As shown in Figures 1A to 2A and Figure 6(A), when the outer case body 30 is in its basic state, each bottom-side auxiliary part forming section 52 and each second side-side auxiliary part forming section 56 overlap (Figure 6(A)), and each folding auxiliary part 50 as a whole is a single piece. Each folding support section 50 is flexible, just like the other elements of the outer case body 30, and can change between a position where it extends horizontally outward (Figure 2A) and a position where it extends vertically upward along the second side portion 36 (its outer surface) of the outer case (Figure 1) when the outer case body 30 is in its basic state (it can also change to a position where it extends vertically downward or a position where it extends horizontally along the bottom portion 32 (its lower surface) of the outer case). 【0089】 As shown in Figures 2A and 4, a hook-and-loop fastener (female) 58 is provided at the tip of each folding support section 50 (the surface facing the second side section 36 of the outer case). In response to this, a hook-and-loop fastener (male) 48 is provided on each second side portion 36 of the outer case. With the outer case body 30 in its basic state, each folding auxiliary part 50 is detachably attached to each second side part 36 of the outer case by connecting the hook-and-loop fastener (female) 58 and the hook-and-loop fastener (male) 48 in a vertically upward orientation (Figure 1). 【0090】 As described above based on Figures 2A and 4, in each folding auxiliary part 50, the bottom auxiliary part forming part 52 and the second side auxiliary part forming part 56 are joined at the stitching joint 54 and stitching joint 55, but the base edge of each bottom auxiliary part forming part 52 (the boundary portion with the outer case bottom 32) and the base edge of each second side auxiliary part forming part 56 (the boundary portion with the outer case second side 36) are not joined (as described above, the outer case second side 36 and the outer case bottom 32 are not directly joined). In other words, in each folding support section 50, apart from the stitched joint sections 54 and 55, the bottom support section forming sections 52 (Figure 4) of the outer case bottom sheet 31 and the second side support section forming sections 56 (Figure 4) of the outer case second side sheet 35 are not connected. 【0091】 Therefore, as shown in Figures 6(B) and (C), the portion of each folding auxiliary part 50 closer to the base edge than the stitched joint 55 is separable from the bottom auxiliary part forming part 52 and the second side auxiliary part forming part 56, under the constraint of the stitched joint 54 on the pair of hypotenuses. As shown in Figure 6(B), the separation of the bottom auxiliary part forming part 52 and the second side auxiliary part forming part 56 creates an internal space in each folding auxiliary part 50. The internal space formed in each folding support section 50 is in communication with the internal space formed by the bottom 32 of the outer case, the first side sections 34 of both outer cases, and the second side sections 36 of both outer cases. 【0092】 Next, the lid 60 will be described in detail based on Figures 2A to 2C, etc. As described above, the lid 60 has a main body portion 61, a mounting piece 62, and a folding piece 65, and is detachably connected to the outer case body 30 at the mounting piece 62 (Figures 1A and 1B). The main body 61 of the lid 60 is a rectangular, thick plate-like structure corresponding to the opening (Figure 1B(a), Figure 2A) of the outer case body 30 (basic state), and both have a pair of long and short sides. The main body 61 is formed by covering a thick plate-shaped insulating material with a sheet-shaped cover made of synthetic resin. 【0093】 As shown in Figures 2A to 2C, the attachment piece 62 is formed on one long edge of the main body portion 61 of the lid 60. The folding piece 65 is formed on the other long edge of the main body portion 61. In all cases, they extend a short distance from the upper edge of the end face that forms the edge of the long side of the main body portion 61 (the upper edge in the closed position in Figure 1A). 【0094】 The attachment piece 62 and the bending piece 65 are in the form of flexible sheets. As described above, the main body portion 61 of the lid 60 is formed by covering a thick plate-shaped insulating material with a synthetic resin sheet-like cover, and the attachment piece 62 and the folding piece 65 are integrally formed with the main body portion 61 of the lid 60 by the cover. 【0095】 The mounting piece 62 is pivotable (rotatable) relative to the main body portion 61 of the lid 60 at its base edge. The mounting piece 62 can change between two positions relative to the main body 61: a position in which it extends horizontally downward from the upper edge of the edge of the main body 61 (a position in the opposite direction to the natural position), with the main body 61 virtually always positioned in the closed position (Figure 1A), and a position in which it extends horizontally along the upper surface of the main body 61 (a position in the opposite direction to the natural position). Both sides of the piece to be attached, 62, are provided with hook-and-loop fasteners (female) (not shown). 【0096】 The folded piece 65 is also able to swing (rotate) relative to the main body portion 61 of the lid 60 at its base edge. The folding piece 65, as described above, can also change between two positions relative to the main body 61, with the main body 61 virtually always kept horizontal, a position in which it extends horizontally and continuously with the upper surface of the main body 61 (natural position), a position in which it extends perpendicularly to the main body 61 downwards from the upper edge of the edge of the main body 61, and a position in which it extends horizontally along the upper surface of the main body 61 (a position in the opposite direction to the natural position). As shown in Figures 1B(b), 2B, and 2C, a hook-and-loop fastener (female) 66 is provided on the inner surface of the folded piece 65. 【0097】 Next, we will explain the relationships between each element. As shown in Figures 1B and 2A, the size (external dimensions) of the inner case body 10 corresponds to the internal size (internal dimensions) of the outer case body 30. In other words, the width (external dimensions in the width direction) and depth (external dimensions in the depth direction) of the inner case body 10 are slightly shorter than the internal dimensions in the width direction and the internal dimensions in the depth direction of the outer case body 30. The height of the inner case body 10 (external dimension in the height direction) is approximately the same as the internal dimension of the outer case body 30 in the height direction minus the thickness of the main body portion 61 of the lid body 60. In this way, the inner case body 10 is housed almost completely without any gaps inside the outer case body 30 (internal space). 【0098】 As shown in Figure 2A, a hook-and-loop fastener (male) 44 is provided near the upper edge of the inner surface of each first side portion 34 of the outer case body 30. Correspondingly, a hook-and-loop fastener (female) 24 is provided near the upper edge of each first side portion of the inner case body 10. In this way, with the inner case body 10 housed almost completely snugly inside the outer case body 30 (internal space) (Figure 1B), the hook-and-loop fastener (male) 44 and the hook-and-loop fastener (female) 24 are connected, and the inner case body 10 is detachably connected to the outer case body 30. 【0099】 As shown in Figures 2A to 2C, a clamping piece 45 is provided on the upper edge and its vicinity on the inner surface of the first side portion 34 of the outer case 30 on one side (the back side) of the outer case body 30. The clamping piece 45 is a strip-shaped sheet that extends along the entire width of the outer case body 30, and its base edge is connected to the vicinity of the upper edge of the inner surface of the first side portion 34 of the outer case. The clamping piece 45 is pivotable (rotatable) at its base end relative to the first side portion 34 of the outer case, and in its natural position (alongside the first side portion 34 of the outer case), its upper edge is located at approximately the same height as the upper edge of the first side portion 34 of the outer case. A hook-and-loop fastener (male) (not shown) is provided on each of the opposing portions of the clamping piece 45 and the first side portion 34 of the outer case. 【0100】 The lid 60 is detachably connected to the outer case body 30 (the upper edge on its back side) at the attachment piece 62. Before the inner case body 10 is housed inside the outer case body 30, the piece to be attached 62 is inserted between the clamping piece 45 and the portion of the outer case's first side 34 facing the clamping piece 45, and is clamped by both. In this state, the female hook fasteners (described above) provided on both sides of the piece to be attached 62 are connected to the male hook fasteners (described above) provided on the clamping piece 45 and the mutually opposing portions of the outer case's first side 34, respectively. In this way, the lid 60 is detachably connected at the attachment piece 62 to the upper edge and its vicinity on the inner surface of one of the first outer case sides 34 of the outer case body 30. With the inner case body 10 housed inside the outer case body 30, the clamping piece 45 is maintained in its natural position by the inner case body 10. 【0101】 As described above, with the clamping piece 45 maintained in its natural position by the inner case body 10, the lid body 60 (excluding the piece to be attached 62) can swing (open and close) with respect to the base edge of the main body 61. Thus, the lid 60 is displaceable between the closed position (Figure 1A) and the inverted position (Figure 5C). The "closed position" is the position in which the lid 60 is horizontal, as shown in Figure 1A, and closes the opening (Figure 1B(a)) of the article storage case (outer case body 30). The "reversed position" is the position where the lid 60 opens from the closed position and faces vertically downward along the outer surface of the first side portion 34 of the outer case, beyond the position where it faces vertically upward, as shown in Figure 5C. As shown in Figure 1B, etc., the position other than the closed position, where the opening (Figure 1B(a)) of this article storage case (outer case body 30) is opened, is referred to as the "open position". When the lid 60 is in the closed position (Figure 1A), the main body 61 of the lid 60 and the upper surface of the inner case body 10 come into contact, improving airtightness. 【0102】 As shown in Figures 1B and 2A, a hook-and-loop fastener (male) 46 is provided near the upper edge of the first side portion 34 of the outer case on the front side of the outer case body 30, extending along its entire width. The hook-and-loop fastener (male) 46 corresponds to the hook-and-loop fastener (female) 66 (Figure 1B) on the folding piece 65 of the lid body 60. Then, with the lid 60 in the closed position, the folding piece 65 is folded perpendicularly to the main body 61 so that it points vertically downward, and the hook-and-loop fastener (male) 46 and hook-and-loop fastener (female) 66 are connected, thereby detachably connecting the folding piece 65 to the first side portion 34 of the outer case on the front side of the outer case body 30. Thus, as shown in Figure 1A, the lid 60 is maintained in the closed position. 【0103】 As shown in Figure 1A(b), a hook-and-loop fastener (male) 47 is also provided on the lower part of the first side portion 34 of the outer case on the back side of the outer case body 30. The hook-and-loop fastener (male) 47 corresponds to the hook-and-loop fastener (female) 66 on the folded piece 65 of the lid body 60. Then, as shown in Figures 5B and 5C, with the lid 60 in the inverted position and the folded piece 65 folded relative to the main body 61 so that it points vertically upward, the hook-and-loop fastener (male) 47 and the hook-and-loop fastener (female) 66 are connected (Figure 5B(b)), thereby detachably connecting the folded piece 65 to the first side portion 34 of the outer case on the back side of the outer case body 30. Thus, as shown in Figure 5C, the lid 60 is maintained in the inverted position. 【0104】 As shown in Figures 1A to 2A, a connecting belt 90 and a connecting piece 95 are provided on each second side portion 36 of the outer case body 30. The connecting belt 90 is connected at its base end to one side edge of the second side portion 36 of the outer case at approximately the center height. A hook-and-loop fastener (female) 91 is provided on the back surface of the connecting belt 90. The piece to be connected 95 is connected at its base end to the other side edge of the second side portion 36 of the outer case at approximately the center height. A hook-and-loop fastener (male) 96 is provided on the front surface of the piece to be connected 95. 【0105】 Similarly, as shown in Figures 1A to 2A, this article storage case is provided with a gripping belt 80. Support belts 82 are provided on the upper portion of each second side portion 36 of the outer case body 30. The support belts 82 extend horizontally and are basically attached to the second side portion 36 of the outer case by sewing at their upper and lower edges. In a portion of the connecting belt 90, corresponding to the width of the gripping belt 80, the connecting belt 90 is joined to the second side portion 36 of the outer case by stitching at two pairs of stitching portions 83 that extend in the width direction (vertical direction) of the connecting belt 90. Between each pair of stitching portions 83, the support belt 82 is not stitched to the second side portion 36 of the outer case at its upper and lower edges. Thus, each second side portion 36 of the outer case has a pair of belt insertion portions 84 formed thereon, corresponding to the width of the gripping belt 80. 【0106】 The gripping belt 80 is slidably inserted through both belt insertion portions 84 of the second side portions 36 of both outer cases, and is formed into a loop shape and attached to the lower surface of the bottom sheet 31 of the outer case. Of the gripping belt 80, the portion above the pair of belt insertion portions 84 on each second side portion 36 of the outer case is designated as the gripping portion 81. 【0107】 Next, the method of use and the effects of this item storage case will be explained based on Figures 5A to 7, etc. This item storage case is set to its basic state (Figure 1A) when storing items, and to its folded state (Figure 5C) when not storing items. 【0108】 To transform from the basic state to the folded state, the following steps are taken: First, in the basic state, as shown in Figure 5A(1), each folding support part 50 is removed from the second side part 36 of the outer case to make it nearly horizontal. Furthermore, as shown in Figure 5A(2), the lid 60 is removed from the closed position and positioned in the inverted position (or a position close to it). 【0109】 Next, as shown in Figures 5A→5B→5C and 7(A)→(C), the outer case 30 and inner case 10 are manipulated to change the inner case 10 from its basic state (Figure 2A) to its folded state (Figure 2C). In this process, the outer case body 30 is flexible and has a folding assist part 50, so it follows the phase change of the inner case body 10 and changes from the basic state (Figure 2A) to a nearly folded state (Figure 2C). 【0110】 In other words, as shown in Figures 2A→2B→2C and 7(A)→(C), when the inner case body 10 gradually changes from its basic state to a folded state, the two first side plates 14 of the inner case move closer together, shortening the depth of the inner case body 10 (the dimension in the depth direction of this item storage case), while the bottom plate 12 of the inner case changes downward in a valley fold shape, causing the inner case body 10 (bottom plate 12 of the inner case) to extend downward. In this way, the inner case body 10 undergoes a phase change inside the outer case body 30, and the outer case body 30 follows this phase change and undergoes a phase change in accordance with the respective folding auxiliary parts 50. 【0111】 As shown in Figures 7(A)→(C), when the inner case body 10 (inner case bottom plate portion 12) tries to extend downward as the pair of divided bottom plate portions 13 move in a direction having a vertically downward component, the outer case bottom portion 32 of the outer case body 30 is pressed downward by the pair of divided bottom plate portions 13, causing the outer case bottom portion 32 of the outer case body 30 to also try to descend in a roughly valley-fold shape. As mentioned above, in each folding support portion 50, the bottom support portion forming portion 52 (Figure 4) and the second side support portion forming portion 56 (Figure 4) are not connected except for the stitching joint portion 54 and the stitching joint portion 55. Therefore, in each folding support portion 50, the bottom support portion forming portion 52 and the second side support portion forming portion 56 can be separated in the portion of the folding support portion 50 that is closer to the base edge than the stitching joint portion 55. Therefore, as described above, when the outer case bottom 32 attempts to descend in a roughly valley-fold shape along with the phase change of the inner case body 10, each folding auxiliary part 50 is pulled downward, and as shown in Figures 6(A)→(C), the portions of each folding auxiliary part 50, both the bottom auxiliary part forming part 52 and the second side auxiliary part forming part 56, that are closer to their base edge than the stitched joint part 55, move downward while separating from each other. Thus, as shown in Figures 7(A)→(C), when the inner case bottom plate portion 12 extends downward, the outer case bottom portion 32 smoothly descends in a roughly valley-fold shape. In this way, the outer case 30 does not hinder the inner case 10 from changing phase toward the folded state, and the inner case 10 smoothly becomes folded. 【0112】 Furthermore, if the folding support section 50 is too large (i.e., too much room), the transformation of the folding support section 50 itself will not proceed smoothly, hindering the smooth transformation of the outer case body 30, and consequently preventing the smooth transformation of the entire item storage case. However, in this article storage case, the folding support portion 50 (bottom-side support portion forming portion 52, second side-side support portion forming portion 56) is an isosceles triangle shape, and its width gradually narrows from the base edge towards the tip. As a result, this does not occur, and as shown in Figure 5B, the folding support portion 50 transforms smoothly, and the transformation of the outer case body 30, and consequently the article storage case, proceeds smoothly. 【0113】 When the inner case bottom plate portion 12 is extended to its maximum downward position (i.e., when the inner case bottom plate portion 12 is folded), the portion of the second side auxiliary portion forming portion 56 closer to the base edge than the stitching joint portion 55, and the portion of the bottom auxiliary portion forming portion 52 closer to the base edge than the stitching joint portion 55, are in a nearly vertical state, continuous with the outer case second side portion 36. This state represents the limit to which the outer case body 30 can extend downward. Conversely, the outer case body 30 can extend downward to that state, and in that state, the inner case bottom plate portion 12 is folded (the inner case body 10 is folded). The stitched joint portion 55 is provided at such a position. 【0114】 Even if the stitched joint 54 is located closer to the tip of the folding support part 50 than the position described above, or if the stitched joint 54 is not provided, this item storage case can still be transformed from its basic state to a folded state. However, the fact that the stitched joint 54 is provided in the position described above means that, under the condition that this article storage case can be folded, the stitched joint 54 is provided in the position closest to the base edge of the folding auxiliary part 50. This prevents the bottom auxiliary part forming part 52 and the second side auxiliary part forming part 56 from being too far apart in the folding auxiliary part 50, and prevents the folding auxiliary part 50 from changing shape irregularly. 【0115】 As described above, the outer case 30 does not hinder the inner case 10 from changing to a folded state, and as the inner case 10 attempts to change to a folded state, the outer case 30 also follows suit and attempts to change to a nearly folded state smoothly. In this way, the item storage case smoothly transforms into a folded state. 【0116】 As described above, the inner case body 10 and the outer case body 30 are transformed into a folded state and a nearly folded state, and at some point, as shown in Figure 5B → Figure 5C, the lid 60, which is in the inverted position (or a position close to it), is fixed to the outer surface of the second side portion 36 of the outer case. Similarly, as shown in Figures 5B and 5C, the connecting belt 90 is attached to the piece to be connected 95 to maintain the folded state of this item storage case. 【0117】 As described above, this item storage case can be easily transformed from its basic state to a folded state. 【0118】 Furthermore, by performing the reverse operation described above, it is possible to easily transform the device from its folded state to its basic state. That is, as shown in Figure 5C → Figure 5B, the connecting belt 90 is removed from the piece to be connected 95. Next, as shown in Figures 5C → 5B → 5A, by attempting to change the inner case body 10 from the folded state to the basic state, the outer case body 30 also attempts to follow suit and change from the approximately folded state to the basic state. At this time, the auxiliary piece forming section 52 and the auxiliary piece forming section 56 in each folding auxiliary section 50 move closer together. At some point, as shown in Figure 5C → Figure 5B, the lid 60, which is in the reversed position and fixed to the outer surface of the second side portion 36 of the outer case, is removed from the outer surface of the second side portion 36 of the outer case and positioned in the closed position or the like. As described above, this item storage case can be easily transformed from a folded state to its basic state. 【0119】 [Example 2] Next, an article storage case, which is Embodiment 2 of the present invention, will be described with reference to Figures 8 to 12. Example 2 is a further improvement on Example 1. The explanation will focus on the differences from Example 1, and elements common to both Example 1 and Example 2 will be denoted by the same reference numerals, with detailed explanations omitted as appropriate. 【0120】 As shown in Figures 9A to 9C, similar to Example 1, this article storage case is also a double-layered case, having an inner case body 10 and an outer case body 30, as well as a lid 260. Furthermore, this item storage case is also foldable and can change between a basic rectangular parallelepiped shape (Figure 8A) and a folded state (Figure 11C). Similarly, the lid 260 is openable and closable, and can be displaced between a double-edge connected state (Figure 8A) and a single-edge connected state (Figure 8B). Furthermore, the lid 260 is foldable and can switch between a flat state (Figures 8A to 9A, 11A) and a folded state (Figures 9C, 11C). In this respect, this article storage case differs from that of Embodiment 1. 【0121】 The "basic state" of this item storage case is, as in Example 1, a state in which the inner case body 10 is in a basic state of being a rectangular parallelepiped (inner case basic state), the outer case body 30 is also in a basic state of being a rectangular parallelepiped (outer case basic state), and the lid body 260 is in a basic state (lid basic state), as shown in Figures 8A, 9A, 11A, and 12(A). The "basic state (basic lid state)" of the lid 260 is a state in which it is both a straight plate state and a state in which both edges are joined. 【0122】 The "folded state" of this item storage case is a state in which the inner case body 10 is in a folded state (inner case folded state), the outer case body 30 is in a nearly folded state corresponding to the folded inner case body 10 (outer case nearly folded state) (as is the same as in Example 1), and the lid body 260 is in a state where both edges are joined and folded (lid both edges joined and folded state). The "double-edge-jointed folded state" of the lid 260 refers to a state in which it is both folded and double-edge-jointed. 【0123】 As mentioned above, the lid 260 is openable and closable and can be displaced between a double-edge connected state (Figure 8A) and a single-edge connected state (Figure 8B) (this is the same as in Example 1). "Double-edge connection state" refers to a state in which the lid 260 is connected to the outer case body 30 at both edges of its pair of long sides, as shown in Figure 8A, while "single-edge connection state" refers to a state in which the lid 260 is connected to the outer case body 30 at only one edge of its pair of long sides, as shown in Figure 8B, and the other edge is detached from the outer case body. 【0124】 Furthermore, as also mentioned above, unlike in Example 1, the lid 260 is foldable and can change between a flat state (Figures 8A to 9A, 11A) and a folded state (Figure 9C, 11C). The "flat state" refers to the state in which the material is not bent and forms a single flat sheet (a single flat sheet) as a whole. The "bent state" refers to the state in which the material is bent into an inverted V shape (an inverted V shape in the above-mentioned state where both edges are joined) as shown in Figures 9C and 11C. 【0125】 The inner case body 10, as in Example 1, can change between a basic state (inner case basic state) (Figure 9A, Figure 12(A)) and a folded state (inner case folded state) (Figure 9C, Figure 12(C)). 【0126】 The "basic state (basic inner case state)" of the inner case body 10 is a state in which, as shown in Figures 9A and 12(A), the pair of first inner case side plate portions 14 are separated (first side wall separated state), and both the inner case bottom plate portion 12 and the inner case second side plate portion 16 are in the basic state (bottom plate basic state and second side plate basic state). 【0127】 The "separated state (first side plate separation state)" of the pair of inner case first side plate portions 14 is the state in which both inner case first side plate portions 14 are separated from each other to the greatest extent, as shown in Figures 9A and 12(A). The "basic state (basic state of the bottom plate)" of the inner case bottom plate portion 12 is, as shown in Figures 9A and 12(A), a single flat plate that extends perpendicularly and horizontally to both inner case first side plate portions 14. The "basic state (basic state of the second side panel)" of the inner case second side panel 16 is, as shown in Figures 9A and 12(A), a single flat plate formed by both divided side panel sections 17, and is perpendicular to both inner case first side panel sections 14. 【0128】 The "folded state (folded inner case state)" of the inner case body 10 refers to a state in which, as shown in Figures 9C and 12(C), the pair of first inner case side plate portions 14 are in close proximity (first side wall portion close proximity state), and both the inner case bottom plate portion 12 and the inner case second side plate portion 16 are in a folded state (bottom plate portion folded state and second side plate portion folded state). 【0129】 The "proximity state (proximity state of first side plates)" of the pair of inner case first side plate portions 14 refers to the state in which both inner case first side plate portions 14 are closest to each other, as shown in Figures 9C and 12(C). The "folded state (folded bottom plate state)" of the inner case bottom plate portion 12 refers to a state in which each divided bottom plate portion 13 hangs vertically downward from the corresponding inner case first side plate portion 14, and the two divided bottom plate portions 13 overlap each other, as shown in Figures 9C and 12(C). Furthermore, each divided bottom plate section 13 extends almost vertically, and there are cases where the two divided bottom plate sections 13 are close to each other but do not overlap (do not make surface contact). The "folded state (folded state of the second side plate)" of the inner case second side plate portion 16 is a state in which, as shown in Figure 9C, the two divided bottom plate portions 13 overlap with their outer surfaces (outer surfaces in the basic state) facing each other, are parallel to both inner case first side plate portions 14, and overlap both inner case first side plate portions 14 between them. In addition, both divided side plate portions 17 extend inward almost parallel to both inner case first side plate portions 14, and in some cases, the two inner case first side plate portions are close to each other but do not overlap (do not make surface contact) between the two inner case first side plate portions 14, and extend almost along the two inner case first side plate portions 14. 【0130】 The outer case body 30, like in Example 1, can also change between a basic state (outer case basic state) (Figure 9A, Figure 12(A)) and a nearly folded state (outer case nearly folded state) (Figure 9C, Figure 12(C)). As shown in Figures 9A and 12(A), the basic state of the outer case 30 (outer case basic state) corresponds to the basic state of the inner case 10 (inner case basic state). As shown in Figures 9C and 12(C), the nearly folded state of the outer case 30 (outer case nearly folded state) corresponds to the folded state of the inner case 10 (inner case folded state). 【0131】 The "basic state (basic state of the outer case)" of the outer case body 30 is a state in which, as shown in Figures 9A and 12(A), the pair of first outer case sides 34 are separated (first side separated state), and both the outer case bottom 32 and the second outer case side 36 are in a basic state (bottom basic state and second side basic state). The "separated state (first side separation state)" of the pair of first outer case sides 34 refers to the state in which the two first outer case sides 34 are separated from each other to their greatest extent. The "basic state (basic state of the bottom) and the second side of the outer case (basic state of the second side)" of the bottom 32 and the second side of the outer case (basic state of the second side) are both states in a planar, natural state. 【0132】 The "approximately folded state (approximately folded state of the outer case)" of the outer case body 30 is the following state, as shown in Figures 9C and 12(C). The pair of outer case first side portions 34 are in a state where they are quite close to each other, corresponding to the two inner case first side plate portions 14 which are in close proximity. The bottom portion 32 of the outer case is folded in a roughly valley-fold shape, corresponding to the folded bottom plate portion 12 of the inner case (Figure 12(C)). The outer case's second side portion 36, together with the folding assist portion 50 which is almost vertical, is in a folded state corresponding to the folded state of the inner case's second side plate portion 16. 【0133】 As shown in Figures 9A to 10, the lid 260 has a main body portion 61, a mounting piece 62, and a folding piece 65, similar to the lid 60 of Embodiment 1. The main body portion 61 of the lid 260 is formed by covering a thick plate-shaped insulating material with a sheet-shaped cover made of synthetic resin. 【0134】 As shown in Figure 9A, the main body 61 of the lid 260 is a rectangular, thick plate-like structure corresponding to the opening (Figure 8B(a), Figure 9A) of the outer case body 30 (basic state), and both have a pair of long sides (first side of the lid) and short sides (second side of the lid). In other words, the long side (first side of the lid) and short side (second side of the lid) of the main body portion 61 of the lid 260 correspond to the long side (first side of the bottom plate) and short side (second side of the bottom plate) of the bottom plate portion 12 of the inner case body 10, respectively. 【0135】 The dimensions of the long side (first side of the lid) and the short side (second side of the lid) of the main body portion 61 of the lid 260 are as follows: The long side (first side of the lid) of the main body portion 61 of the lid 260 is the same size as the long side (first side of the bottom plate) of the bottom plate portion 12 of the inner case body 10, and is the same size as the long side (width) of the first side plate portion 14 of the inner case. The shorter side (second side of the lid) of the main body portion 61 of the lid 260 has dimensions equal to the shorter side (second side of the bottom plate) of the bottom plate portion 12 of the inner case body 10 plus the thickness of the pair of first side plate portions 14 of the inner case, and the shorter side (width) of the second side plate portion 16 of the inner case plus the thickness of the pair of first side plate portions 14 of the inner case. Therefore, as described above, both the first inner case side plate portion 14 and the second inner case side plate portion 16 of the inner case body 10 are in the shape of thick plates, and a rectangular frame having a predetermined width is formed on the upper end surface of the inner case body 10, and the main body portion 61 (its edge portion) of the lid body 260 corresponds to the outer edge of the rectangular frame. 【0136】 As shown in Figures 9A to 9C, similar to Embodiment 1, the attachment piece 62 is formed on the edge of one long side of the main body portion 61 of the lid 260. The folding piece 65 is formed on the edge of the other long side of the main body portion 61. Both extend a short distance from the upper edge of the end face that forms the long side edge of the main body portion 61 (the upper edge in the closed position in Figure 8A). The mounting piece 62 is pivotable (rotatable) relative to the main body portion 61 of the lid 260 at its base edge (the boundary portion between the two is bendable). The folding piece 65 is also able to swing (rotate) relative to the main body portion 61 of the lid 260 at its base edge (the boundary portion between the two is foldable). 【0137】 The lid 260 is coupled to the outer case body 30 in the same manner as in Example 1, as shown below, and can switch between a single-edge coupling state (Figure 8B) and a double-edge coupling state (Figure 8A). 【0138】 As shown in Figures 8A to 9C, the lid 260 is detachably connected to the outer case body 30 at the mounting piece 62 (Figures 9A to 9C) (Figures 8A and 8B). That is, before the inner case body 10 is housed inside the outer case body 30, the mounting piece 62 is inserted between the clamping piece 45 and the first side portion 34 of the outer case (the portion facing the clamping piece 45) (Figures 9A to 9C), and the hook-and-loop fasteners (female) provided on both sides of the mounting piece 62 are connected to the hook-and-loop fasteners (male) (described above) provided on the mutually opposing portions of the clamping piece 45 and the first side portion 34 of the outer case, respectively. As a result, as shown in Figure 8B, the lid 260 is in a state where at least one edge is joined. 【0139】 Then, as shown in Figure 8A, the lid 260 is detachably connected to the first side portion 34 of the outer case on the front side of the outer case body 30 at the folding piece 65. That is, with the lid 260 in the closed position, the folding piece 65 is folded perpendicular to the main body 61 so that it points vertically downward, and the hook-and-loop fastener (male) 46 (Figure 8B) and the hook-and-loop fastener (female) 66 (Figure 8B) are connected, thereby detachably connecting the folding piece 65 to the first side portion 34 of the outer case on the front side of the outer case body 30. As a result, the lid 260 is in a state where both edges are joined, as shown in Figure 8A. 【0140】 As described above in Example 1, the height of the inner case body 10 (external dimension in the height direction) is approximately the same as the internal dimension of the outer case body 30 in the height direction minus the thickness of the main body portion 61 of the lid body 60. Therefore, the upper surface of the main body portion 61 of the lid 60 and the upper edge of the outer case body 30 are at approximately the same height. 【0141】 As shown in Figures 9A to 10, the main body portion 61 of the lid 260 has a pair of divided lids 262 that are divided along the lid fold line 261. The lid fold line 261 connects the centers of the two short sides of the main body portion 61 of the lid 260 and extends in the direction of the long side of the main body portion 61. The two divided lids 262 are connected to each other so as to be able to swing (rotate) at the lower edges of the opposing end faces of the two divided lids 262. 【0142】 More precisely, the lid fold line 261 is the part that connects the two lower edges, and the main body portion 61 of the lid 260 is divided into a pair of divided lids 262 by the surface including the lid fold line 261. The two divided lids 262 are then connected at the lid fold line 261 so that they can be folded upwards (upwards when both edges are joined) in a mountain fold shape. Therefore, the main body portion 61 of the lid 260 can be folded upwards (upwards when both edges are joined) in a mountain fold shape along the lid fold line 261. 【0143】 As mentioned above, the main body 61 of the lid 260 is formed by covering a thick plate-shaped insulating material with a sheet-like cover made of synthetic resin, and is described in detail as follows. The insulation material is divided into a pair of divided insulation materials corresponding to each divided lid 262, and both divided insulation materials are covered by a cover so that both divided lids 262 can swing as described above. This also applies to the inner case bottom plate portion 12 (Examples 1 and 2) and the inner case second side plate portion 16 (same). 【0144】 As mentioned above, the boundary portion between the main body 61 and the attachment piece 62 of the lid 260 is foldable, and similarly, the boundary portion between the main body 61 and the folding piece 65 is also foldable. Therefore, in the state where both edges are joined, the lid 260 is inherently able to swing (rotate) relative to the upper edge of the outer case body 30 at each long side (first side of the lid) of the main body 61. 【0145】 Thus, the lid 260 (its main body 61) can change between a flat state (Figure 9A, Figure 12(A)) and a folded state (Figure 9C, Figure 12(C)) even when both edges are joined together. 【0146】 The "flat state" of the lid 260 refers to the state in which it forms a single flat plate (one flat plate) as a whole, as shown in Figure 9A. As mentioned above, the basic state (basic state of the lid) is when both edges are joined and the lid is flat. In other words, the "basic state (basic state of the lid)" of the lid 260 is, as shown in Figure 9A, a single flat plate shape overall, extending perpendicularly and horizontally to both inner case first side plate portions 14, and is in the closed position. 【0147】 The "folded state" of the lid 260 refers to the state in which it is folded along the lid fold line 261, as shown in Figure 9C. In the state where both edges are joined and the lid is folded, the lid 260 is folded into an inverted V shape, that is, upward in a mountain fold shape (convex shape), and each divided lid 262 is connected to each other by a lid fold line 261 that extends diagonally upward from the corresponding first side plate portion 14 of the inner case. 【0148】 The lid 260 (its main body portion 61) is in a flat state when the two edges opposite to the lid folding line 261 of the two divided lids 262 are separated to their maximum extent, and changes to a folded state when these two edges come closer together. Thus, when the outer case body 30 is in its basic state (outer case basic state) (Figure 9A), the lid body 260 (its main body portion 61) is in a flat state, and when the outer case body 30 is in a nearly folded state (outer case nearly folded state) (Figure 9C), the lid body 260 (its main body portion 61) is in a folded state. 【0149】 Magnets 263a and 263b may be embedded near the mutually opposing portions of each divided cover 262. In this case, the mutually opposing portions of magnets 263a and 263b are given opposite poles (one is the north pole and the other is the south pole). In this case, the lid 260 (its main body 61) can be easily maintained in a flat state. 【0150】 Next, the method of use and effects of this article storage case will be explained based on Figures 8A and 11A to 11C. In the following explanation, we will focus on the differences from Example 1, and will generally omit explanations of points that are the same as in Example 1. This item storage case is set to its basic state (Figure 8A) when storing items, and to its folded state (Figure 11C) when not storing items. 【0151】 To transform from the basic state to the folded state, the following steps are taken: First, in the basic state, as shown in Figure 11A, each folding support part 50 is removed from the second side part 36 of the outer case to make it nearly horizontal. In this case, unlike in Example 1, no manipulation is performed on the lid 260, and it is maintained in its state of being joined at both edges. 【0152】 Next, as shown in Figures 11A → 11B → 11C, the outer case body 30 and the inner case body 10 are manipulated to change the state of this article storage case from the basic state (Figure 11A) to the folded state (Figure 11C). 【0153】 As shown in Figures 11A and 11B, by pressing the two outer case second side portions 36 of the outer case 30 inward so that their central portions in the width direction (depth direction of this article storage case) are slightly closer to each other, the two inner case second side plate portions 16 (their central portions in the width direction) of the inner case 10 (Figure 9A) are pressed inward (pressed via the two outer case second side portions 36). Thus, as shown in Figures 9A and 9B, the inner case body 10 undergoes a slight phase change from its basic state (inner case basic state) (Figure 9A) to a folded state (inner case folded state) (Figure 9C), while the outer case body 30 also undergoes a slight phase change from its basic state (outer case basic state) (Figure 9A) to a partially folded state (outer case partially folded state) (Figure 9C). In other words, the pair of first side plates 14 of the inner case body 10 change phase slightly from a separated state (first side plate separated state) (Figure 9A) to a close state (first side wall close state) (Figure 9C), while the pair of first side parts 34 of the outer case body 30 move slightly closer to each other from a separated state (first side separated state) (Figure 9A). Consequently, the lid 260 (its main body 61) undergoes a slight phase change from a flat state (Figure 9A) to a folded state (Figure 9C). In other words, as the fold line 261 of the lid 260 is displaced upward, the lid 260 (its main body 61) is slightly folded upward in an inverted V shape, that is, in a mountain-fold (convex) shape. 【0154】 Furthermore, as shown in Figures 11B and 11C, by pressing both first side portions 34 of the outer case body 30 inward so that they move closer to each other, both first side plate portions 14 of the inner case body 10 (Figure 9B) are also pressed inward so that they move closer to each other. In this way, the inner case body 10 transforms into a folded state (inner case folded state) (Figure 9C), while the outer case body 30 also transforms into a nearly folded state (outer case nearly folded state) (Figure 9C). Consequently, the lid 260 (its main body 61) changes to a folded state (Figure 9C). In other words, as the fold line 261 of the lid 260 is further displaced upward, the lid 260 (its main body 61) is folded to its maximum extent into an inverted V shape, that is, to its maximum extent into a mountain fold (convex shape) upward. 【0155】 As described above, this item storage case can be easily transformed from its basic state (Figure 11A) to its folded state (Figure 11C). 【0156】 Furthermore, by performing the reverse operation described above, it is possible to easily transform from the folded state (Figure 11C) to the basic state (Figure 11A). 【0157】 As described above, in this article storage case, the lid 260 can be transformed between the basic state and the folded state while both edges remain connected. Therefore, it is possible to transform from the basic state to the folded state, and vice versa, even more easily than in Example 1. In other words, in Example 1, the basic state is a double-edge connected state as shown in Figures 1A and 5A(1), but in other states, it is necessary to connect one edge and position it in the inverted position as shown in Figures 5A(2) to 5C, but this extra step can be eliminated. 【0158】 Furthermore, in Example 1, as shown in Figure 5C, when folded, the lid 260 is in the reversed position as described above, and the inner surface of the lid 260 (its main body 61) (the inner surface in the basic state) is exposed to the outside. However, in this article storage case, as shown in Figure 11, this does not happen, and in this respect as well, this article storage case is superior. In other words, the inner surface of the lid 260 (its main body 61) faces the articles stored inside, but when it is exposed to the outside in the folded state, it may become dirty. In that case, there is a risk that the articles stored inside will become dirty when they are placed inside again. However, in this article storage case, even when folded, the inner surface of the lid 260 (its main body 61) (the inner surface in the basic state) is not exposed to the outside as in Example 1. Therefore, the inner surface is prevented from becoming dirty, and the articles stored inside are prevented from becoming dirty. 【0159】 [Example 3] Next, an article storage case, which is Embodiment 3 of the present invention, will be described with reference to Figures 13 and 14. Example 3 is a modification of Example 2, and will be explained primarily in terms of the differences from Example 2. 【0160】 The main body portion 61 of the lid 360 is divided into three sections along a pair of lid folding lines 361, and has a pair of main divided lids 362 (first side divided lids) and one sub-divided lid 363 (center side divided lid). Each main divided cover 362 (first-side divided cover) includes the long side (first side of the cover) of the main body portion 61 of the cover 360, while the sub-divided cover 363 is located between the two main divided covers 362 and is positioned in the center of the main body portion 61 of the cover 360. 【0161】 The lid 360 (and its main body 61) is in a flat state, similar to that of Embodiment 2, forming a single flat plate shape overall. The folded state of the lid 360 (its main body portion 61) (the folded state when both edges are joined) is such that the main divided lid 362 extends vertically upward, and the sub-divided lid 363 is horizontal above it. In this way, the lid 360 (its main body portion 61) is folded upward in a convex shape. 【0162】 [Modified versions of Examples 1-3] As shown in Figures 2A and 9A, the inner case bottom plate portion 12 of Examples 1 to 3 is located below the lower end surface of both inner case second side plate portions 16, while being located inside both inner case first side plate portions 14, and the lower surface of the inner case bottom plate portion 12 and the lower end surface of both inner case first side plate portions 14 are flush. However, the following embodiments are also possible, not limited to this one. 【0163】 Similar to the main body portion 61 of the lid 260 in Examples 2 and 3 (Figure 9A) (however, inverted vertically), the lower end surfaces of the first side plates 14 of both inner cases and the lower end surfaces of the second side plates 16 of both inner cases are flush, and the bottom plate portion 12 of the inner case (its edge) may correspond to the outer edge of a rectangular frame having a predetermined width formed by the lower end surfaces of the first side plates 14 and the second side plates 14 of the inner case. In other words, the inner case bottom plate portion 12 may be located below the lower end surfaces of the first inner case side plate portions 14 and the lower end surfaces of the second inner case side plate portions 16. In that case, the inner case bottom plate portion 12 swings (rotates) at the upper edge of its long side end surface relative to the outer edge of the lower end surface of the inner case first side plate portion 14. Thus, in the folded state of this item storage case, the bottom plate portion 12 of the inner case becomes folded, and the pair of divided bottom plate portions 16 of the bottom plate portion 12 become convex downwards and are folded into a V-shape. 【0164】 [Modified versions of Examples 2 and 3] As shown in Figure 9A, the main body portion 61 (and its edge) of the lid 260 in Embodiment 2 corresponds to the outer edge of a rectangular frame having a predetermined width formed by the upper end surface of the inner case body 10. That is, it is located above the upper end surfaces of the first side plate portions 14 of both inner cases and the upper end surfaces of the second side plate portions 16 of both inner cases. The same applies to the lid 360 in Embodiment 3. However, the following embodiments are also possible, not limited to this one. 【0165】 Similar to the inner case bottom plate portion 12 in Examples 1 to 3 (Figures 2A and 9A) (however, inverted vertically), the upper end surfaces of the second side plate portions 16 of both inner cases are lower than the upper end surfaces of the first side plate portions 14 of both inner cases by a length corresponding to the thickness of the main body portion 61 of the lid 260. The main body portion 61 of the lid 260 is located above the upper end surfaces of the second side plate portions 16 of both inner cases, while being located inside the second side plate portions 16 of both inner cases, and the upper surface of the main body portion 61 and the upper end surfaces of the first side plate portions 14 of both inner cases are flush. In that case, the main body portion 61 of the lids 260 and 360 pivots (rotates) at the upper edge of the end face of its long side relative to the inner edge of the upper end face of the first side plate portion 14 of the inner case. The width of the mounting piece 62 and the folding piece 65 of the lids 260 and 360 are made longer by the same amount as the thickness of the first side plate portion 14 of the inner case. Thus, in the folded state of this item storage case, the lid is in a folded state, and the pair of divided lids 262 of the lid 260 overlap each other and extend vertically upward. 【0166】 It should be noted that the above are merely a few examples of the present invention, and it goes without saying that the present invention can be implemented in various modified forms based on the knowledge of those skilled in the art. [Explanation of Symbols] 【0167】 10 Inner case body 11. Folding line of the base plate 12. Bottom plate of the inner case 13 Split bottom plate part 14. First side panel of the inner case 15. Folding line of the second side plate 16. Second side panel of the inner case 17 Split side plate part 30 Outer case body 31. Sheet for the bottom of the outer case 32 Bottom of the outer case 34 Outer case, first side 35 Sheet for the second side of the outer case 36 Outer case second side 50 Folding support section 52 Bottom side auxiliary part forming part 55. Sewn-on joint (joint) 56 Second side auxiliary forming part 90 Connecting belt (belt) 260,360 Lids 261,361 Lid fold lines 262 divided lid 362 Main split lid (split lid), 363 Sub split lid (split lid)

Claims

[Claim 1] An article storage case in which an inner case body is housed in an outer case body, The inner case body has an inner case bottom plate, a pair of inner case first side plate portions, and a pair of inner case second side plate portions. The inner case bottom plate portion is rectangular in shape, each having a pair of first and second bottom plate sides, and has a plurality of divided bottom plate portions divided along a bottom plate folding line that extends parallel to the pair of first bottom plate sides, and is capable of transitioning between a basic state of the bottom plate portion that is a horizontal flat plate and a folded state of the bottom plate portion that is folded downward in a convex shape along the bottom plate folding line. The pair of inner case first side plates are connected at their lower edges to the pair of first sides of the inner case bottom plate so as to be able to swing with respect to each other. The pair of inner case second side plates correspond to the pair of second sides of the inner case bottom plate, and are not joined to the said second sides of the inner case bottom plate at their lower edges. Each of its own side edges is pivotably connected to each of the side edges of the pair of inner case first side plate portions, It has multiple divided side plate sections divided along a second side plate section bending line extending in the height direction of the second side plate section, and is capable of transitioning between a basic state of the second side plate section forming a flat plate shape and a folded state of the second side plate section being folded inward in a convex shape along the second side plate section bending line. The inner case body is capable of transitioning between a basic inner case state in which the pair of first inner case side plates are separated from each other, the bottom plate is in its basic bottom plate state, and the pair of second inner case side plates are in their basic second side plate state, and a folded inner case state in which the pair of first inner case side plates are in close proximity to each other, the bottom plate is in its folded bottom plate state, and the pair of second inner case side plates are in their folded second side plate state. The outer case body is formed of a flexible sheet and, without hindering the phase change of the inner case body between the basic inner case state and the folded inner case state, is capable of phase change between the basic outer case state corresponding to the basic inner case state and the substantially folded outer case state corresponding to the folded inner case state, in accordance with the phase change of the inner case body. A case for storing items. [Claim 2] The article storage case according to claim 1, The plurality of divided bottom plate sections are a pair of divided bottom plate sections obtained by dividing the inner case bottom plate section into two along the bottom plate section folding line, and the folded state of the bottom plate section is such that the inner case bottom plate section is folded downward in a valley fold shape along the bottom plate section folding line, and both divided bottom plate sections extend almost vertically, in a case for storing articles. [Claim 3] An article storage case according to claim 1 or claim 2, The plurality of divided side plate sections are a pair of divided side plate sections obtained by dividing the second side plate section of the inner case into two along the folding line of the second side plate section, and the folded state of the second side plate section is such that the second side plate section of the inner case is folded inward in a valley fold shape along the folding line of the second side plate section, and both divided side plate sections extend substantially along the pair of first side plate sections of the inner case, in an article storage case. [Claim 4] The article storage case according to claim 1, Furthermore, it has a lid, The lid has a rectangular lid body portion having a pair of first lid sides extending parallel to the first sides of the pair of base plates, and a pair of second lid sides extending parallel to the second sides of the pair of base plates. The lid body portion is pivotable at the first side of the pair of lids relative to the upper edge of the outer case body or the inner case body. The lid has a plurality of divided lids separated along a lid folding line that extends parallel to the first side of the pair of lids, and is capable of transitioning between a basic lid state that is a horizontal flat plate and a folded lid state in which the lid is folded upward in a convex shape along the lid folding line. The basic state of the inner case is further characterized in that the lid body is in the basic lid state, and the folded state of the inner case is further characterized in that the lid body is in the folded lid state. A case for storing items. [Claim 5] The article storage case according to claim 4, The plurality of divided lids are a pair of divided lids in which the lid body is divided into two along the lid folding line, and the folded state of the lid is such that the lid body is folded upward in a mountain fold shape, in an article storage case. [Claim 6] The article storage case according to claim 4, An article storage case, wherein the plurality of divided lids are a pair of first-side divided lids and a central-side divided lid, the lid body portion of which is divided along a plurality of lid folding lines, the pair of first-side divided lids include the pair of first sides of the lid, and the central-side divided lid is located between the pair of first-side divided lids. [Claim 7] The article storage case according to claim 1, The outer case body has an outer case bottom, a pair of outer case first side parts, a pair of outer case second side parts, and a pair of folding assist parts. The bottom of the outer case corresponds to the bottom plate portion of the inner case body, The pair of first outer case sides correspond to the pair of first inner case side plates of the inner case body, The pair of outer case second side portions correspond to the pair of inner case second side plate portions of the inner case body, The pair of folding assist parts connect the bottom of the outer case and the second side of the outer case, and as the inner case bottom plate attempts to change from the basic state of the bottom plate to the folded state, the pair of divided bottom plate parts of the inner case bottom plate attempt to move in a direction having a vertical downward component, and are pulled downward based on pressing the bottom of the outer case downward, thereby extending the outer case body downward in a direction having a vertical component between the pair of second side parts of the outer case and the bottom of the outer case, and allowing the inner case bottom plate to change from the basic state of the bottom plate to the folded state. A case for storing items. [Claim 8] The article storage case according to claim 7, The pair of folding support parts are formed by combining a bottom-side support part forming part that is formed in a continuous manner with the bottom of the outer case by a sheet forming the bottom of the outer case, and a second-side support part forming part that is formed in a continuous manner with the second side of the outer case by a sheet forming the second side of the outer case. A case for storing items. [Claim 9] The article storage case according to claim 8, The bottom auxiliary forming portion extends toward its tip, with the boundary portion with the bottom of the outer case serving as its base edge. The second side auxiliary forming portion corresponds to the bottom auxiliary forming portion, and extends toward its tip portion with the boundary portion with the second side portion of the outer case as its base edge. The folding auxiliary portion is formed by joining the portion of the bottom auxiliary portion forming portion other than the base edge and the portion of the second side auxiliary portion forming portion other than the base edge. A case for storing items. [Claim 10] The article storage case according to claim 9, The bottom auxiliary forming portion has a base edge at the boundary with the bottom of the outer case, and its width gradually narrows towards its tip. The second side auxiliary forming portion corresponds to the bottom auxiliary forming portion and has a shape in which the boundary portion with the second side of the outer case is the base edge, and the width gradually narrows towards its tip. A case for storing items. [Claim 11] The article storage case according to claim 9, In the aforementioned folding auxiliary portion, the vicinity of the center of the bottom auxiliary portion forming portion and the vicinity of the center of the second side auxiliary portion forming portion are joined to form a joint portion. When the inner case body is in the folded state, the portion of the bottom auxiliary forming portion that is closer to the base edge than the connecting portion and the portion of the second side auxiliary forming portion that is closer to the base edge than the connecting portion are in a nearly vertical state continuous with the second side of the outer case. A case for storing items. [Claim 12] The article storage case according to claim 7, Each of the aforementioned folding auxiliary parts is detachably attached to the second side of each outer case when the article storage case is in the basic state. A case for storing items. [Claim 13] The article storage case according to claim 7, The outer case body is provided with a belt that, when the article storage case is in the folded state, connects the pair of first outer case sides in a way that prevents them from being separated and allows them to be detachably connected. A case for storing items.

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