Packaging containers

Abstract

To enable effectively suppressing movement of an inner container in a closed lid state according to a three point type packaging container comprising an outer container, the inner container, and a lid.SOLUTION: A packaging container (1) comprises an outer container, an inner container, and a lid body. The outer container comprises an outside flange part (23) and an outside reverse taper part (25). The inner container comprises an inside flange part (33). The lid body comprises a lid body flange part (43) and a lid body reverse taper part (45). The outside reverse taper part (25) and the lid body reverse taper part (45) are engaged with each other in a state where the inside flange part (33) is vertically sandwiched by the outside flange part (23) and the lid body flange part (43).SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a packaging container. [Background technology]

[0002] A packaging container is currently in use that includes an outer container, an inner container that is supported by the outer container and contained therein, and a lid that covers the top opening of the outer container. This three-piece packaging container can, for example, contain a first food ingredient in the outer container and a second food ingredient in the inner container, making it suitable for packaging foods in which it is preferable that the two ingredients remain completely separate until just before eating.

[0003] An example of a three-piece packaging container is disclosed in, for example, Registered Utility Model No. 3052893 (Patent Document 1). The packaging container of Patent Document 1 is closed by placing horizontal portion 21b of inner container 20 (corresponding to the "inner container") on horizontal portion 11b of lower container 10 (corresponding to the "outer container"), and then placing horizontal portion 31a of lid 30 (corresponding to the "lid body") on top of that. In this closed state, locking protrusion 31c formed on hanging portion 31b of lid 30 is located below locking portion 11d provided on the outer edge of lower container 10.

[0004] In the structure of the packaging container of Patent Document 1, when a force is applied to the lid 30 in the opening direction, the locking projection 31c of the lid 30 can lock onto the locking portion 11d of the lower container 10 from below. However, under normal circumstances, a gap exists between the locking projection 31c and the locking portion 11d (see Figure 1 of Patent Document 1). As a result, the lower container 10, the inner container 20, and the lid 30 are not sufficiently secured to one another when the lid is closed, which can cause the inner container to shift inside the packaging container during transport. This movement of the inner container inside the packaging container is undesirable, as it can lead to the lid opening unintentionally or food ingredients contained in the inner container scattering. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Registered Utility Model No. 3052893 Summary of the Invention [Problem to be solved by the invention]

[0006] In a three-piece packaging container having an outer container, an inner container, and a lid, it is desirable to be able to effectively prevent the inner container from moving when the lid is closed. [Means for solving the problem]

[0007] The packaging container according to the present invention comprises: A packaging container formed by sheet molding, comprising an outer container, an inner container accommodated in the outer container while being supported by the outer container, and a lid covering an upper opening of the outer container, the outer container has an outer bottom surface portion, an outer peripheral wall portion extending upward from the outer bottom surface portion, an outer flange portion extending outward from the outer peripheral wall portion, and an outer reverse tapered portion provided on the peripheral edge side of the outer flange portion, the inner container has an inner bottom surface, an inner peripheral wall portion extending upward from the inner bottom surface, and an inner flange portion extending outward from the inner peripheral wall portion, the lid body has a top surface portion, a lid body peripheral wall portion extending downward from the top surface portion, a lid body flange portion extending outward from the lid body peripheral wall portion, and a lid body reverse tapered portion provided on the peripheral edge side of the lid body flange portion, The outer reverse tapered portion and the lid reverse tapered portion are fitted together in a state in which the inner flange portion placed on the outer flange portion is sandwiched between the outer flange portion and the lid flange portion from above and below.

[0008] With this configuration, the outer reverse tapered portion and the lid reverse tapered portion fit together, firmly securing the outer container and the lid. In this state, the inner flange of the inner container is sandwiched between the outer flange of the outer container and the lid flange, so the firmly secured outer container and lid can further firmly secure the inner container. This effectively prevents the inner container from moving when the lid is closed.

[0009] Preferred embodiments of the present invention will be described below, but the scope of the present invention is not limited to the preferred embodiments described below.

[0010] In one embodiment, the outer container further has at least one outer gripping portion formed of a protruding piece protruding outward from the outer flange portion, the lid further has at least one lid grip portion formed of a protruding piece protruding outward beyond the lid flange portion, It is preferable that the outer gripping portion and the lid gripping portion overlap each other.

[0011] With this configuration, the lid can be easily opened by pinching the lid handle, which is a protruding piece that protrudes outward from the lid flange. In the closed state, the lid handle and the main body handle overlap, preventing the lid from being accidentally opened by getting caught on the lid handle.

[0012] In one embodiment, It is preferable that the inner container is supported in a state of being fitted inside the outer container.

[0013] According to this configuration, the movement of the inner container can be more effectively suppressed.

[0014] In one embodiment, It is preferable that the outer peripheral wall portion is formed with a bulging portion that bulges outward.

[0015] This configuration increases the rigidity of the outer container and reduces twisting, thereby also preventing the inner container from moving.

[0016] In one embodiment, It is preferable that a reverse tapered fitting portion, where the outer reverse tapered portion and the lid reverse tapered portion fit together, be provided intermittently on the outer periphery of the container.

[0017] This configuration prevents the outer container and the lid from being fitted together too tightly compared to a configuration in which the reverse tapered fitting portion is provided around the entire circumference of the container, thereby effectively preventing unintentional opening of the lid without compromising ease of opening when necessary.

[0018] In one embodiment, The insulating film is formed in a shape in plan view having at least a pair of opposing side portions and a connecting side portion connecting the opposing side portions, It is preferable that the reverse tapered fitting portion is independently provided at the center of the pair of opposing sides.

[0019] This configuration allows the fitting force between the outer container and the lid to be increased appropriately at each of the opposing sides.

[0020] In one embodiment, It is preferable that the reverse tapered fitting portions are further provided independently at both ends of the pair of opposing sides.

[0021] According to this configuration, the fitting force between the outer container and the lid body at each of the opposing sides can be further increased appropriately.

[0022] In one embodiment, It is preferable that the reverse tapered fitting portion is independently provided at the center of the connecting side portion.

[0023] According to this configuration, the fitting force between the outer container and the lid can be increased appropriately at each connecting side portion.

[0024] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which is given with reference to the drawings. [Brief explanation of the drawings]

[0025] [Figure 1] An exploded perspective view of a packaging container [Figure 2] Exploded front view of packaging container [Figure 3]Side view of outer container [Figure 4] Plan view of outer container [Figure 5] Cross-sectional view of a packaging container with the lid closed [Figure 6] Cross-sectional view of another embodiment of a packaging container DETAILED DESCRIPTION OF THE INVENTION

[0026] An embodiment of a packaging container will be described with reference to the drawings. In this embodiment, a packaging container (food packaging container) 1 that contains food such as boxed lunches or side dishes as the contents therein will be described as an example. The packaging container 1 of this embodiment is suitable for packaging food containing two types of ingredients that are preferably kept completely separate until just before eating.

[0027] In the following, the direction toward the inside of the packaging container 1 (the direction from the outer edge toward the center) will be referred to as "inward," and the direction toward the outside of the packaging container 1 (the direction from the center toward the outer edge) will be referred to as "outward."

[0028] As shown in Figures 1 to 3, the packaging container 1 comprises an outer container 2, an inner container 3, and a lid 4. The packaging container 1 is formed by sheet molding. The outer container 2, inner container 3, and lid 4 that constitute the packaging container 1 are each formed by sheet molding.

[0029] The outer container 2, inner container 3, and lid 4 can be formed by thermoforming (e.g., vacuum forming, pressure forming, vacuum pressure forming, hot plate forming, etc.) a synthetic resin sheet having a thickness of, for example, 0.1 mm to 3 mm (preferably 0.2 mm to 1.5 mm). The sheet thicknesses of the outer container 2, inner container 3, and lid 4 may differ from one another.

[0030] The synthetic resin sheets constituting the outer container 2, inner container 3, and lid 4 can be, for example, thermoplastic resin sheets such as polyolefin-based resin sheets, polystyrene-based resin sheets, and polyester-based resin sheets. These can be foamed or non-foamed sheets. Laminated sheets can also be used, such as film-laminated foam sheets in which a film is laminated on a foamed sheet, coextrusion laminate sheets, and extrusion laminate sheets.

[0031] The outer container 2 and the inner container 3 may be colored, for example, black or white, or may be colorless and transparent. The lid 4 of this embodiment is formed to be colorless and transparent. By making the lid 4 colorless and transparent, the food contained therein can be easily seen from the outside. At least one of the outer container 2, the inner container 3, and the lid 4 may have a design such as a pattern.

[0032] The packaging container 1 is formed in a shape in plan view having at least a pair of opposing side portions So that face each other and a connecting side portion Sc that connects the pair of opposing side portions So. As shown in Figures 1 and 4, the packaging container 1 of this embodiment is formed in an elliptical shape in plan view. The packaging container 1 has a pair of linear opposing side portions So and a pair of semicircularly curved connecting side portions Sc.

[0033] As shown in Figures 1 to 4, the outer container 2 has an outer bottom surface portion 21, an outer peripheral wall portion 22, an outer flange portion 23, an outer skirt portion 24, an outer reverse tapered portion 25, and an outer gripping portion 26. The outer container 2 is suitable for containing a first foodstuff such as white rice or pasta noodles. The outer bottom surface portion 21 is formed in an elliptical shape in a plan view. The outer peripheral wall portion 22 extends upward from the outer bottom surface portion 21. The outer peripheral wall portion 22 is formed continuously from the outer edge of the outer bottom surface portion 21. The outer peripheral wall portion 22 is formed so as to slope outward as it extends upward.

[0034] In this embodiment, the outer peripheral wall portion 22 is formed with bulging portions 27 that bulge outward. In this embodiment, two types of bulging portions 27 are formed as such bulging portions 27: a triangular prism-shaped bulging portion 27A and a semi-cylindrical bulging portion 27B. The triangular prism-shaped bulging portion 27A is formed so as to point outward. The triangular prism-shaped bulging portion 27A is formed on the curved surface 22a of the outer peripheral wall portion 22 (the surface located at a position corresponding to the connecting side portion Sc). The semi-cylindrical bulging portion 27B is formed so as to be rounded outward. The semi-cylindrical bulging portion 27B is formed near the boundary between the flat surface 22b of the outer peripheral wall portion 22 (the surface located at a position corresponding to the opposing side portion So) and the curved surface 22a. The provision of such bulging portions 27 can increase the rigidity of the outer container 2, thereby suppressing twisting of the outer container 2.

[0035] The outer flange 23 extends outward from the outer peripheral wall 22. The outer flange 23 extends outward in the horizontal direction from the upper end of the outer peripheral wall 22. An inner flange 33 provided on the inner container 3 is placed on this outer flange 23. The outer skirt 24 extends downward from the outer end of the outer flange 23. An outer reverse tapered portion 25 is formed in a lower region of this outer skirt 24. The outer reverse tapered portion 25 is formed so as to slope inward as it extends downward. In this embodiment, a groove 24G recessed inward along the entire periphery is formed in the lower region of the outer skirt 24. The outer reverse tapered portion 25 is formed by the inner wall above the groove 24G. As a result, the outer reverse tapered portion 25 is provided closer to the periphery than the outer flange 23 and is formed along the entire periphery. A lid body reverse tapered portion 45 provided on the lid body 4, which will be described later, fits into the outer reverse tapered portion 25 from the outside.

[0036] The outer gripping portion 26 extends outward in the horizontal direction from the lower end of the outer skirt portion 24. The outer gripping portion 26 is composed of a protruding piece that protrudes outward beyond the outer flange portion 23, and at least one outer gripping portion 26 is provided on the outer container 2. In this embodiment, a total of two outer gripping portions 26 are provided at two diagonally opposite positions. The outer gripping portion 26 has a flat gripping surface portion 26A and an upper protrusion portion 26B that protrudes upward from the gripping surface portion 26A. A lid gripping portion 46 provided on the lid 4, which will be described later, is placed on the outer gripping portion 26.

[0037] As shown in Figures 1 and 2, the inner container 3 is housed in the outer container 2 while being supported by the outer container 2. The inner container 3 has an inner bottom surface 31, an inner peripheral wall 32, and an inner flange 33. The inner container 3 is suitable for housing a second food ingredient, such as a side dish or pasta sauce. The inner bottom surface 31 is elliptical in plan view. The inner bottom surface 31 is provided with a partition wall 37 that rises from the inner bottom surface 31.

[0038] The inner peripheral wall 32 extends upward from the inner bottom surface 31. The inner peripheral wall 32 is formed continuously from the outer edge of the inner bottom surface 31. The inner peripheral wall 32 is formed so as to slope outward as it extends upward. The portion of the inner peripheral wall 32 located at the position of the connecting edge Sc forms an upward protruding portion 32A that protrudes above the outer container 2 when supported by the outer container 2.

[0039] The inner flange 33 extends outward from the inner peripheral wall 32. The inner flange 33 extends outward in the horizontal direction. The inner flange 33 is placed on the outer flange 23 of the outer container 2. In this manner, the inner container 3 is supported by the outer container 2 with the inner flange 33 placed on the outer flange 23. Furthermore, a lid flange 43 provided on the lid 4 is placed on the inner flange 33.

[0040] As shown in Figures 1 and 2, the lid body 4 covers the upper opening of the outer container 2. The lid body 4 also covers the upper opening of the inner container 3 supported by the outer container 2. The lid body 4 has a top surface 41, a lid body peripheral wall 42, a lid body flange 43, a lid body skirt 44, a lid body reverse tapered portion 45, and a lid body knob 46. The top surface 41 is formed in an elliptical shape in a plan view. The lid body peripheral wall 42 extends downward from the top surface 41. The lid body peripheral wall 42 is formed continuously from the outer edge of the top surface 41. The lid body peripheral wall 42 is formed so as to slope outward as it extends downward.

[0041] The lid flange 43 extends outward from the lid peripheral wall 42. The lid flange 43 extends outward in the horizontal direction from the lower end of the lid peripheral wall 42. The lid skirt 44 extends downward from the outer end of the lid flange 43. A lid reverse taper 45 is formed in a lower region on the inner surface of the lid skirt 44. The lid reverse taper 45 is formed so as to slope inward as it extends downward. In this embodiment, linear protrusions 44P that protrude inward are formed in a lower region of the outer skirt 24. The upper surfaces of the linear protrusions 44P are formed so as to slope inward as they extend downward, and the upper surfaces of the linear protrusions 44P form the lid reverse taper 45. As a result, the lid reverse taper 45 is located closer to the periphery than the lid flange 43.

[0042] The lid reverse tapered portions 45 are provided intermittently in the circumferential direction of the lid skirt portion 44. In this embodiment, a total of eight linear protrusions 44P (lid reverse tapered portions 45) are provided intermittently in the circumferential direction. The lid reverse tapered portions 45 are provided independently at the center of each opposing side portion So, at both ends of each opposing side portion So (boundaries with the connecting side portion Sc), and at the center of each connecting side portion Sc. The lid reverse tapered portions 45 fit externally into the outer reverse tapered portion 25 of the outer container 2.

[0043] The lid gripping portion 46 extends horizontally outward from the lower end of the lid skirt portion 44. The lid gripping portion 46 is composed of a protruding piece that protrudes outward beyond the lid flange portion 43, and at least one lid gripping portion 46 is provided on the lid 4. In this embodiment, a total of two lid gripping portions 46 are provided at two diagonally positioned locations corresponding to the two outer gripping portions 26 of the outer container 2. The lid gripping portion 46 has a flat gripping surface 46A and a downward protrusion 46B that protrudes downward from the gripping surface 46A. The lid gripping portion 46 is placed over the outer gripping portion 26 of the outer container 2.

[0044] As shown in Fig. 5, the outer reverse tapered portion 25 of the outer container 2 and the lid reverse tapered portion 45 of the lid 4 are fitted together to form the reverse tapered fitting portion 15. The reverse tapered fitting portion 15 is a portion where reverse tapered surfaces that slope inward as they go downward fit together, so the fitting force is strong and a strong fit can be achieved. Therefore, the lid 4 is unlikely to come off the outer container 2. The inclination θ of the reverse tapered fitting portion 15 with respect to the vertical line is preferably, for example, 30° to 90°.

[0045] As described above, the outer reverse tapered portion 25 is formed around the entire circumference, and the lid reverse tapered portion 45 is provided intermittently in the circumferential direction. Therefore, the formation position of the reverse tapered fitting portion 15 depends on the formation position of the lid reverse tapered portion 45, and the reverse tapered fitting portion 15 is provided intermittently on the outer periphery of the container. More specifically, the reverse tapered fitting portion 15 is provided independently at the center of each opposing side portion So, at both ends of each opposing side portion So (at the boundary with the connecting side portion Sc), and at the center of the connecting side portion Sc.

[0046] In this way, by providing the reverse tapered fitting portions 15 intermittently, it is possible to prevent the outer container 2 and the lid 4 from being fitted together more tightly than necessary, and to appropriately increase the fitting force between the outer container 2 and the lid 4. Therefore, it is possible to effectively prevent the lid from being unintentionally opened without compromising the ease of opening the lid when necessary.

[0047] The outer flange portion 23 of the outer container 2, the inner flange portion 33 of the inner container 3, and the lid flange portion 43 of the lid 4 are formed to be parallel to one another. As shown in Fig. 5, in the closed state, these are overlapped with each other so that the outer flange portion 23 and the inner flange portion 33 are in surface contact, and the inner flange portion 33 and the lid flange portion 43 are also in surface contact. That is, the inner flange portion 33 is placed on the outer flange portion 23, and the inner flange portion 33 is sandwiched between the outer flange portion 23 and the lid flange portion 43 from above and below. In this state, the outer reverse tapered portion 25 and the lid reverse tapered portion 45 fit together.

[0048] In this configuration, the outer reverse tapered portion 25 and the lid reverse tapered portion 45 are fitted together at the reverse tapered fitting portion 15, firmly securing the outer container 2 and the lid 4. In this state, the inner flange portion 33 of the inner container 3 is sandwiched between the outer flange portion 23 of the outer container 2 and the lid flange portion 43 of the lid 4 from above and below, so the firmly secured outer container 2 and lid 4 can further firmly secure the inner container 3. This effectively prevents the inner container 3 from moving when the lid is closed. By making the inner container 3 less likely to move, it is possible to effectively prevent the lid from opening unintentionally and prevent food ingredients contained in the inner container 3 from scattering.

[0049] Other Embodiments (1) In the above embodiment, the reverse tapered fitting portions 15 are independently provided at the center of each opposing side portion So, at both ends of each opposing side portion So (at the boundary with the connecting side portion Sc), and at the center of the connecting side portion Sc. However, the present invention is not limited to such a configuration. For example, the reverse tapered fitting portions 15 may be independently provided only at the center of each opposing side portion So and the center of the connecting side portion Sc. Alternatively, the reverse tapered fitting portions 15 may be provided only at the boundary between each opposing side portion So and each connecting side portion Sc. Furthermore, any number of the reverse tapered fitting portions 15 may be provided at each opposing side portion So and each connecting side portion Sc. Furthermore, for example, the reverse tapered fitting portions 15 may be provided corresponding to the positions where at least the outer gripping portion 26 and the cover gripping portion 46 are formed. The area where the outer gripping portion 26 and the lid body gripping portion 46 overlap is defined as the "lid opening area," and the reverse tapered fitting portion 15 may be formed over almost the entire lid opening area, or may be formed intermittently in areas other than the lid opening area.

[0050] (2) In the above embodiment, when the reverse tapered fitting portion 15 is provided intermittently in the circumferential direction, the outer reverse tapered portion 25 is formed around the entire circumference, and the lid reverse tapered portion 45 is formed intermittently in the circumferential direction. However, the present invention is not limited to such a configuration, and for example, the outer reverse tapered portion 25 may also be formed intermittently at the position where the lid reverse tapered portion 45 is formed.

[0051] (3) In the above embodiment, the reverse tapered fitting portion 15 is provided intermittently in the circumferential direction. However, the present invention is not limited to such a configuration. For example, the reverse tapered fitting portion 15 may be provided continuously around the entire circumference. In this case, the lid body reverse tapered portion 45 is also formed continuously around the entire circumference.

[0052] (4) In the above embodiment, an example has been described in which two types of bulging portions 27, triangular prism-shaped bulging portions 27A and semi-cylindrical bulging portions 27B, are formed on the outer peripheral wall portion 22 as bulging portions 27 that bulge outward. However, the present invention is not limited to such a configuration. For example, only triangular prism-shaped bulging portions 27A may be formed on the outer peripheral wall portion 22, or only semi-cylindrical bulging portions 27B may be formed on the outer peripheral wall portion 22. Furthermore, the specific shape of the bulging portions 27 is not limited to a triangular prism shape or a semi-cylindrical shape, and any shape may be used. Furthermore, the bulging portions 27 do not necessarily have to be formed on the outer peripheral wall portion 22.

[0053] (5) In the above embodiment, the inner container 3 is supported by the outer container 2 with the inner flange portion 33 of the inner container 3 placed on the outer flange portion 23 of the outer container 2. However, the present invention is not limited to such a configuration. For example, as shown in Fig. 6, the packaging container 1 may have an inner fitting portion Fi, and the inner container 3 may be supported in a state of being fitted inside the outer container 2.

[0054] (6) In the above embodiment, an example has been described in which the outer gripping portion 26 and the lid gripping portion 46 are provided in two diagonally opposite positions, with the outer gripping portion 26 and the lid gripping portion 46 overlapping each other. However, the present invention is not limited to such a configuration, and the outer gripping portion 26 and the lid gripping portion 46 may be provided in only one position, or in three or more positions. Furthermore, the outer gripping portion 26 and the lid gripping portion 46 do not necessarily have to overlap each other, and the lid gripping portion 46 may be provided in a position where there is no outer gripping portion 26, or the outer gripping portion 26 may be provided in a position where there is no lid gripping portion 46.

[0055] (7) In the above embodiment, the packaging container 1 is described as having an oval shape in a plan view. However, the packaging container 1 is not limited to such a shape, and may be formed into a polygonal shape (e.g., a rectangular shape, a pentagonal shape, a hexagonal shape, an octagonal shape, etc.) or a circular shape in a plan view.

[0056] (8) The configurations disclosed in the above-described embodiments (including the above-described embodiments and other embodiments; the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. Regarding other configurations, the embodiments disclosed in this specification are illustrative in all respects and can be appropriately modified within the scope of the present disclosure. [Explanation of symbols]

[0057] 1 Packaging container 2 Outer container 3 Inner container 4 Lid 15 Reverse tapered mating part 21 Outer bottom part 22 Outer peripheral wall 23 Outer flange 25 Outer reverse tapered section 26 Outer grip 27 Bulge 31 Inner bottom part 32 Inner peripheral wall 33 Inner flange 41 Top section 42 Lid peripheral wall 43 Lid flange 45 Reverse tapered part of the lid 46 Lid grip

Claims

1. A packaging container formed by sheet molding, comprising an outer container, an inner container accommodated in the outer container while being supported by the outer container, and a lid covering an upper opening of the outer container, the outer container has an outer bottom surface portion, an outer peripheral wall portion extending upward from the outer bottom surface portion, an outer flange portion extending outward from the outer peripheral wall portion, and an outer reverse tapered portion provided on the peripheral edge side of the outer flange portion, the inner container has an inner bottom surface, an inner peripheral wall portion extending upward from the inner bottom surface, and an inner flange portion extending outward from the inner peripheral wall portion, the lid body has a top surface portion, a lid body peripheral wall portion extending downward from the top surface portion, a lid body flange portion extending outward from the lid body peripheral wall portion, and a lid body reverse tapered portion provided on the peripheral edge side of the lid body flange portion, the inner flange portion, which is placed on the outer flange portion, is sandwiched between the outer flange portion and the lid flange portion from above and below, and the outer reverse tapered portion and the lid reverse tapered portion are fitted together; The outer peripheral wall portion has a plurality of flat surfaces and a plurality of curved surfaces connecting two of the flat surfaces, a first bulging portion bulging outward and extending in a vertical direction, and a second bulging portion bulging outward and extending in a vertical direction, the second bulging portion having a shape different from that of the first bulging portion, A packaging container in which the first bulging portion and the second bulging portion are connected via the curved surface.

2. 2. The packaging container according to claim 1, wherein the inner container is supported in a state of being fitted into the outer container, the inner flange portion being located inside the position sandwiched vertically between the outer flange portion and the lid flange portion.

3. the outer container further has an outer second reverse tapered portion located adjacent to the outer flange portion on the inside thereof, the inner container further has an inner reverse tapered portion located adjacent to the inner flange portion on the inside, 3. The packaging container according to claim 1, wherein the inner container is supported by the outer container in a state in which the inner reverse tapered portion and the second outer reverse tapered portion are fitted together.

4. A packaging container formed by sheet molding, comprising an outer container, an inner container accommodated in the outer container while being supported by the outer container, and a lid covering an upper opening of the outer container, the outer container has an outer bottom surface portion, an outer peripheral wall portion extending upward from the outer bottom surface portion, an outer flange portion extending outward from the outer peripheral wall portion, and an outer reverse tapered portion provided on the peripheral edge side of the outer flange portion, the inner container has an inner bottom surface, an inner peripheral wall portion extending upward from the inner bottom surface, and an inner flange portion extending outward from the inner peripheral wall portion, the lid body has a top surface portion, a lid body peripheral wall portion extending downward from the top surface portion, a lid body flange portion extending outward from the lid body peripheral wall portion, and a lid body reverse tapered portion provided on the peripheral edge side of the lid body flange portion, the inner flange portion, which is placed on the outer flange portion, is sandwiched between the outer flange portion and the lid flange portion from above and below, and the outer reverse tapered portion and the lid reverse tapered portion are fitted together; the outer peripheral wall portion has a pair of opposing flat plate-like surfaces, a pair of curved surfaces connecting the pair of flat plate-like surfaces, and a bulging portion bulging outward, The bulging portion is formed in a semi-cylindrical shape that is rounded outward, and is formed at the boundary between the flat surface and the curved surface.

5. The first bulge portion is formed near the center of the curved surface, The packaging container according to claim 1 , wherein the second bulging portion is formed on the curved surface near the boundary between the curved surface and the flat surface.

6. The first bulge portion is a triangular prism-shaped bulge portion formed so as to be pointed outward, The packaging container according to claim 1 , wherein the second bulging portion is a semi-cylindrical bulging portion that is rounded outward.

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