Shoe

Abstract

To provide a shoe capable of stably fixing a sole body to an upper body.SOLUTION: A shoe 1A includes: a flexible shell 10; a bag-shaped upper body 20 housed in the shell 10; and a sole body 30 stored in the upper body 20. The upper body 20 includes a lower wall part 21, an inner foot side wall part 22A, an outer food side wall part 22B, and a belt-like part 23 whose one end 23a is connected to the inner foot side wall part 22A and whose other end 23b is connected to the outer foot side wall part 22B. The sole body 30 is put between the lower wall part 21 and the belt-like part 23, so that the sole body 30 is fixed to the upper body 20.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to shoes.

Background Art

[0002] For example, Japanese Unexamined Patent Application Publication No. 2022-127292 (Patent Document 1) and Japanese Unexamined Patent Application Publication No. 2022-127293 (Patent Document 2) disclose shoes including a flexible shell, a bag-shaped upper body housed in the shell, and a sole body housed in the upper body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] When adopting a configuration in which the sole body is housed in the bag-shaped upper body as disclosed in Patent Documents 1 and 2 above, since the upper body is made of a relatively soft member, a problem arises as to how to fix the sole body inside the upper body.

[0005] If the sole body is not sufficiently fixed to the upper body, displacement may occur between the upper body and the sole body during use, and a gap may be formed between them, resulting in problems such as a significant impairment of the fit for the wearer's foot and the stability during landing. Also, even in the initial state after the completion of the manufacture of the finished shoe including the shell, the upper body, and the sole body and before the shoe is used, depending on the designed shapes of the upper body and the sole body, a gap may be formed between them from the beginning. Furthermore, it is feared that the gap may expand due to the use of the shoe, and there is a concern that the shoe may lack fit and stability.

[0006] On the other hand, although it is assumed that the upper body and the sole body are joined using an adhesive, when such a fixing structure is adopted, since the adhesive contains a corresponding amount of organic solvent, it is not necessarily preferable from the viewpoint of environmental load.

[0007] Therefore, the present disclosure aims to stably fix the sole body to the upper body without using an adhesive or while reducing the amount of adhesive used in a shoe having a configuration in which the sole body is housed in a bag-shaped upper body.

Means for Solving the Problems

[0008] A shoe according to one aspect of the present disclosure has an insertion space into which a wearer's foot is inserted, and includes a flexible shell, an upper body, and a sole body. The shell includes a bottom wall portion having a ground contact surface and a peripheral wall portion erected from the periphery of the bottom wall portion. The upper body is housed in the shell and has a bag-like shape provided with an opening into which the wearer's foot can be inserted. The sole body is configured to support the sole of the wearer's foot and is located above the bottom wall portion by being housed in the upper body. The peripheral wall portion has an inner-foot-side peripheral wall portion configured to cover the inner-foot-side portion of the wearer's foot and an outer-foot-side peripheral wall portion configured to cover the outer-foot-side portion of the wearer's foot. The upper body includes a lower wall portion extending along the bottom wall portion, an inner-foot-side wall portion extending along the inner-foot-side peripheral wall portion, an outer-foot-side wall portion extending along the outer-foot-side peripheral wall portion, and a belt-like portion having one end connected to the inner-foot-side wall portion and the other end connected to the outer-foot-side wall portion. In the shoe according to one aspect of the present disclosure, the sole body is sandwiched between the lower wall portion and the belt-like portion, so that the sole body is fixed to the upper body.

Effect of the Invention

[0009] According to the present disclosure, in a shoe adopting a configuration in which a sole body is housed in a bag-like upper body, it is possible to stably fix the sole body to the upper body without using an adhesive or while reducing the amount of adhesive used.

Brief Description of the Drawings

[0010]

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Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

[0012] (Embodiment 1) (A. Schematic Configuration of Shoe) FIG. 1 is a perspective view of a shoe according to Embodiment 1, and FIG. 2 is a perspective view of the shoe shown in FIG. 1 as viewed from another direction. FIG. 3 is a plan view of the shoe shown in FIG. 1, and FIG. 4 is a side view of the shoe shown in FIG. 1 as viewed from the outside of the foot side. FIGS. 5 to 7 are cross-sectional views taken along lines V-V, VI-VI, and VII-VII shown in FIG. 3, respectively. Further, FIG. 8 is an exploded perspective view for explaining the assembly structure of the shoe shown in FIG. 1. First, with reference to FIGS. 1 to 8, the schematic configuration of the shoe 1A according to the present embodiment will be described.

[0013] As shown in FIGS. 1 to 8, the shoe 1A according to the present embodiment is in the form of a sock that covers substantially the entire foot of the wearer (that is, the part on the end side rather than the ankle). The shoe 1A includes a shell 10, an upper body 20, a sole body 30 (see FIGS. 3, 5 to 8), an additional sole body 40 (see FIGS. 6 to 8), and a heel counter 50 (see FIGS. 6 to 8). At the upper part of the shoe 1A, an opening 2 for inserting the foot is provided, and at the lower part of the shoe 1A, a ground contact surface 3 for contacting the ground or the like is provided. Further, inside the shoe 1A, an insertion space SP3 (see FIGS. 1, 3, and 5 to 7) that is a space into which the foot of the wearer is inserted is provided.

[0014] Here, the longitudinal direction X of the shoe 1A is defined as the direction that coincides with the longitudinal direction of the foot of the wearer wearing the shoe 1A. Also, the lateral direction Y of the shoe 1A is defined as the direction that coincides with the width direction of the foot of the wearer wearing the shoe 1A. Further, the vertical direction Z of the shoe 1A is defined as the direction orthogonal to both the longitudinal direction X and the lateral direction Y described above. In particular, in the midfoot part R2 and the rearfoot part R3 of the shoe 1A to be described later, the vertical direction Z is substantially orthogonal to the ground contact surface 3 included in these parts.

[0015] As shown in FIGS. 3 and 4, the shoe 1A includes a forefoot part R1 configured to support the toe part and the stepping part of the wearer's foot along the longitudinal direction X, a midfoot part R2 configured to support the stepped-on part of the wearer's foot, and a rearfoot part R3 configured to support the heel part of the wearer's foot.

[0016] The forefoot part R1, the midfoot part R2, and the rearfoot part R3 are defined as follows based on the shoe center SC (see FIG. 3) of the shoe 1A. Here, the shoe center SC is a straight line obtained by projecting, along the vertical direction Z, a straight line connecting the part between the first toe and the second toe of the wearer and the central part of the calcaneus bone (so-called heel center, which is indicated by the reference sign HC in FIG. 3, etc.) of the wearer when a standard wearer having a foot of a size suitable for the shoe 1A wears it onto the shoe 1A. The direction in which the shoe center SC extends coincides with the longitudinal direction X described above. As a premise, the positions on the shoe center SC and the foremost end and the rearmost end in the longitudinal direction X of the insertion space SP3 are respectively referred to as the front-side end position PF and the rear-side end position PR, and the distance between the front-side end position PF and the rear-side end position PR along the longitudinal direction X is referred to as the total length of the insertion space SP3.

[0017] That is, when a virtual plane passing through the 40% position of the total length of the insertion space SP3 from the front-end position PF and perpendicular to the shoe center SC is defined as the first boundary plane P1, and a virtual plane passing through the 80% position of the total length of the insertion space SP3 from the front-end position PF and perpendicular to the shoe center SC is defined as the second boundary plane P2, the front foot portion R1 corresponds to the portion included between the front-end position PF and the first boundary plane P1 along the front-rear direction X, the middle foot portion R2 corresponds to the portion included between the first boundary plane P1 and the second boundary plane P2 along the front-rear direction X, and the rear foot portion R3 corresponds to the portion included between the second boundary plane P2 and the rear-end position PR along the front-rear direction X.

[0018] Also, as shown in FIG. 3, in the shoe 1A, in a plan view, along the left-right direction Y, the inner foot side portion (the portion on the S1 side shown in FIG. 3) which is the medial side (i.e., the side closer to the midline) in the anatomical neutral position of the foot, and the outer foot side portion (the portion on the S2 side shown in FIG. 3) which is the side opposite to the medial side (i.e., the side farther from the midline) in the anatomical neutral position of the foot are defined.

[0019] As shown in FIGS. 1 to 8, in the shoe 1A, the upper body 20 is housed in the shell 10, and the sole body 30 is housed in the upper body 20. Further, the additional sole body 40 and the heel counter 50 are housed in the shell 10 and are arranged outside the upper body 20. The shell 10, the upper body 20, and the sole body 30 are all located across the front foot portion R1, the middle foot portion R2, and the rear foot portion R3. On the other hand, the additional sole body 40 is located across the middle foot portion R2 and the rear foot portion R3, and the heel counter 50 is located in the rear foot portion R3.

[0020] As shown in FIGS. 1 to 7, the shell 10 forms the outermost shell of the shoe 1A and is made of a flexible member configured in a bag shape having an opening-shaped mouth portion 10a. The shell 10 has an internal space communicating with the mouth portion 10a, and the above-described insertion space SP3 is included in this internal space. In the internal space of the shell 10, the upper body 20, the sole body 30, the additional sole body 40, and the heel counter 50 are arranged.

[0021] The shell 10 includes a bottom wall portion 11 configured to cover the sole of the wearer's foot and a peripheral wall portion 12 configured to cover the peripheral surface of the wearer's foot. The peripheral wall portion 12 is erected so as to continuously extend upward from the periphery of the bottom wall portion 11.

[0022] As shown in FIGS. 5 to 7, the bottom wall portion 11 has an inner surface 11a and an outer surface 11b which are a pair of main surfaces. The inner surface 11a is located on the side of the insertion space SP3, and the outer surface 11b constitutes the outermost surface located on the lower side in the vertical direction Z of the shoe 1A. The outer surface 11b of this bottom wall portion 11 corresponds to the grounding surface 3 described above, and thus the bottom wall portion 11 has the grounding surface 3.

[0023] The peripheral wall portion 12 has an inner peripheral surface 12a and an outer peripheral surface 12b which are a pair of main surfaces. The inner peripheral surface 12a is located on the side of the insertion space SP3, and the outer peripheral surface 12b constitutes the outermost surface located in the front-rear direction X of the shoe 1A, the outermost surface located in the left-right direction Y, and the outermost surface located on the upper side in the vertical direction Z.

[0024] As shown in FIGS. 3 to 7, the peripheral wall portion 12 includes an inner-foot-side peripheral wall portion 12A configured to cover the inner-foot-side portion of the wearer's foot, an outer-foot-side peripheral wall portion 12B configured to cover the outer-foot-side portion of the wearer's foot, a rear-side peripheral wall portion 12C configured to cover the rear surface of the heel portion of the wearer's foot, and a front-side peripheral wall portion 12D configured to cover the front surface of the toe portion of the wearer's foot.

[0025] Note that the height of the peripheral wall portion 12 (i.e., the dimension in the vertical direction Z) is not particularly limited. For example, by making the height of the outer-foot-side peripheral wall portion 12B lower than the height of the inner-foot-side peripheral wall portion 12A at a position corresponding to the opening edge 2, the pressure applied to the wearer's ankle by the shoe 1A can be reduced.

[0026] Here, among the above-described peripheral wall portions 12, the portion configured to cover the toenail of the wearer's foot (that is, the portion located on the upper side in the vertical direction Z of the peripheral wall portion 12) is different from the other portions included in the peripheral wall portion 12. Its thickness is configured to be thin, and it is constituted by a mesh-like structure portion 10b formed by a plurality of linear portions intersecting each other in a direction orthogonal to the thickness direction.

[0027] By configuring in this way, the portion of the peripheral wall portion 12 configured to cover the toenail of the wearer's foot has a lower tensile elastic modulus and a smaller bending rigidity than the other portions included in the peripheral wall portion 12. Therefore, it becomes possible to deform the portion more flexibly. Thus, during wearing, it is possible to improve the fit while preventing excessive pressure from being applied to the toenail of the wearer's foot (especially the ridge line portion of the toenail), and moreover, it becomes difficult to inhibit the bending of the shoe 1A during running or walking, and the shoe 1A becomes more likely to follow the movement of the foot. In addition, the shoe 1A can be put on and taken off more easily.

[0028] Note that, in addition to the above-described structure, the portion of the peripheral wall portion 12 configured to cover the toenail of the wearer's foot may be constituted by a mesh-like structure portion in which polygons such as triangles and quadrilaterals are regularly arranged, or a mesh-like structure portion shaped like a line obtained by Voronoi division.

[0029] As shown in FIGS. 1 to 7, the above-described mouth portion 10a is provided at the upper end of the peripheral wall portion 12. This mouth portion 10a is located straddling the midfoot portion R2 and the rearfoot portion R3. The mouth portion 10a is provided corresponding to the above-described opening edge 2. During the manufacture of the shoe 1A and the like, the upper body 20, the sole body 30, the additional sole body 40, and the heel counter 50 are inserted into the inside of the shell 10 through the mouth portion 10a.

[0030] As shown in FIGS. 5 to 7, the internal space of the shell 10 is defined by the inner surface 11a of the bottom wall portion 11 and the inner peripheral surface 12a of the peripheral wall portion 12. The internal space is located straddling the forefoot portion R1, the midfoot portion R2, and the rearfoot portion R3.

[0031] The inner space of the shell 10 is partitioned into a lower-side space SP1 located in the lower portion in the vertical direction Z of the shoe 1A and an upper-side space SP2 located in the upper portion in the vertical direction Z of the shoe 1A. More specifically, the lower-side space SP1 is a space defined by the inner surface 11a of the bottom wall portion 11 and the inner peripheral surface 12a of the peripheral wall portion 12 of the portion adjacent to the bottom wall portion 11, and the upper-side space SP2 is a space defined by the inner peripheral surface 12a of the portion of the peripheral wall portion 12 located above the portion adjacent to the bottom wall portion 11 in the vertical direction Z.

[0032] As will be described in detail later, the lower-side space SP1 houses the lower portion of the upper body 20, the entire sole body 30, the entire additional sole body 40, and the lower portion of the heel counter 50, and the upper-side space SP2 houses the upper portion of the upper body 20 and the upper portion of the heel counter 50. The upper-side space SP2 further includes the above-described insertion space SP3. The insertion space SP3 is defined by the upper surface of the sole body 30 (more precisely, the top surface 31a of the midsole 31 described later) and the inner peripheral surface 22a of the side wall portion 22 of the portion of the upper body 20 not covered by the sole body 30.

[0033] As shown in FIGS. 1 to 7, the upper body 20 constitutes a part of the portion that contacts the foot of the wearer of the shoe 1A (more specifically, the portion that contacts the peripheral surface of the wearer's foot), and is composed of a bag-shaped member provided with an opening 20a. The upper body 20 is housed in the shell 10 in a state of being overlapped with the bottom wall portion 11 and the peripheral wall portion 12 of the shell 10 so as to cover the inner surface of the shell 10. The upper body 20 is composed of a member that can be flexibly deformed from the viewpoint of improving the fit and ensuring a good wearing comfort.

[0034] The upper body 20 includes a lower wall portion 21 configured to cover the sole of the wearer's foot and a side wall portion 22 configured to cover the peripheral surface of the wearer's foot. The side wall portion 22 is erected so as to continuously extend upward from the peripheral edge of the lower wall portion 21. The lower wall portion 21 extends along the inner surface 11a of the bottom wall portion 11 of the shell 10, and the side wall portion 22 extends along the inner peripheral surface 12a of the peripheral wall portion 12 of the shell 10.

[0035] As shown in FIGS. 5 to 7, the lower wall portion 21 has an inner surface 21a and an outer surface 21b which are a pair of main surfaces. The inner surface 21a is located on the side of the insertion space SP3, and the outer surface 21b is located on the side of the bottom wall portion 11 of the shell 10.

[0036] The side wall portion 22 has an inner peripheral surface 22a and an outer peripheral surface 22b which are a pair of main surfaces. The inner peripheral surface 22a is located on the side of the insertion space SP3, and the outer peripheral surface 22b is located on the side of the peripheral wall portion 12 of the shell 10.

[0037] As shown in FIGS. 3 to 7, the side wall portion 22 includes an inner foot side wall portion 22A configured to cover the inner foot side portion of the wearer's foot, an outer foot side wall portion 22B configured to cover the outer foot side portion of the wearer's foot, a rear side wall portion 22C configured to cover the rear surface of the heel portion of the wearer's foot, and a front side wall portion 22D configured to cover the front surface of the toe portion of the wearer's foot.

[0038] Accordingly, the inner foot side wall portion 22A of the upper body 20 is positioned so as to overlap the inner foot side peripheral wall portion 12A of the shell 10, and the outer foot side wall portion 22B of the upper body 20 is positioned so as to overlap the outer foot side peripheral wall portion 12B of the shell 10. Further, the rear side wall portion 22C of the upper body 20 is positioned so as to overlap the rear side peripheral wall portion 12C of the shell 10, and the front side wall portion 22D of the upper body 20 is positioned so as to overlap the front side peripheral wall portion 12D of the shell 10.

[0039] Note that a belt-like portion 23 is provided on the upper body 20, but the details of this belt-like portion 23 will be described in detail later.

[0040] Further, the upper body 20 is provided with a tightening portion 24, which fixes the shell 10, the upper body 20, and the heel counter 50 to each other. More specifically, the tightening portion 24 has a belt-like shape and is drawn out from the side wall portion 22 of the upper body 20. The tightening portion 24 is inserted into a through-hole-shaped insertion portion provided in the heel counter 50 and a through-hole-shaped insertion portion provided in the shell 10. In this state, the shell 10 and the heel counter 50 are tightened by the tightening portion 24, and the tip of the tightening portion 24 is attached to the upper body 20, whereby the shell 10, the upper body 20, and the heel counter 50 are fixed to each other.

[0041] As shown in FIGS. 1 to 7, the above-described opening 20a is provided at the upper end of the side wall portion 22. The opening 20a is located across the midfoot portion R2 and the rearfoot portion R3. The opening 20a corresponds to the above-described opening edge 2, and when worn, the wearer's foot is inserted into the insertion space SP3 through the opening 20a. The upper end portion of the side wall portion 22 that defines the opening 20a is positioned so as to protrude upward in the vertical direction Z from the mouth portion 10a of the shell 10. Thereby, it is possible to avoid the shell 10 directly contacting the wearer's ankle when worn, and it is possible to ensure a good wearing comfort.

[0042] As shown in FIGS. 5 to 8, the sole body 30 includes a midsole 31 as a cushioning material and a plate 32 as a repellent material. These midsole 31 and plate 32 are laminated in the vertical direction Z such that the midsole 31 is located above the plate 32. The sole body 30 is housed in the shell 10 and is further housed inside the upper body 20.

[0043] The midsole 31 supports the wearer's sole by forming a part of the portion that contacts the wearer's foot of the shoe 1A (more specifically, the portion that contacts the sole of the wearer's foot), and has a substantially flat plate-like shape. The midsole 31 has a top surface 31a and a bottom surface 31b which are a pair of main surfaces. The midsole 31 is composed of an elastically deformable member having a predetermined thickness so that desired cushioning performance can be obtained during landing or the like.

[0044] Here, the top surface 31a of the midsole 31 may be configured to have an uneven shape corresponding to the shape of the wearer's sole from the viewpoint of suppressing the tilting of the wearer's ankle (so-called pronation) that may occur during landing and the collapse of the arch of the wearer's foot.

[0045] The plate 32 has a first main surface 32a and a second main surface 32b which are a pair of main surfaces located in the thickness direction, and a peripheral end surface 32c connecting these first main surface 32a and second main surface 32b. The first main surface 32a faces the upper side in the vertical direction Z, and the second main surface 32b faces the lower side in the vertical direction Z. The plate 32 is composed of a hard member having a smaller thickness than the midsole 31 so that desired repulsion performance can be obtained during kicking or the like.

[0046] As described above, the sole body 30 is configured by laminating the midsole 31 and the plate 32, and the bottom surface 31b of the midsole 31 contacts the first main surface 32a of the plate 32. The midsole 31 and the plate 32 may be joined by, for example, an adhesive, but from the viewpoint of reducing the amount of organic solvent used, it is preferable that the midsole 31 and the plate 32 are not joined.

[0047] The sole body 30 has an upper surface defined by the top surface 31a of the midsole 31 described above, a lower surface defined by the second main surface 32b of the plate 32 described above, and a peripheral surface including the peripheral end surface 32c of the plate 32 described above. Among these, the lower surface of the sole body 30 covers the inner surface 21a of the lower wall portion 21 of the upper body 20, and the peripheral surface of the sole body 30 faces the lower end side portion of the inner peripheral surface 22a of the side wall portion 22 of the upper body 20. As a result, the sole body 30 is located above the bottom wall portion 11 of the shell 10 and further above the lower wall portion 21 of the upper body 20.

[0048] As shown in FIGS. 6 and 7, the additional sole body 40 supports the sole (particularly the lower surface of the heel portion) of the wearer's foot and has a flat shape in which its thickness decreases from the rear end to the front end in the front-rear direction X. The additional sole body 40 functions as a cushioning material and is composed of an elastically deformable member so that a desired cushioning performance can be obtained during landing or the like. Here, the elastic modulus of the additional sole body 40 is different from the elastic modulus of the midsole 31 as the cushioning material included in the sole body 30 described above.

[0049] The additional sole body 40 is located at the rear foot portion R3 as described above, is housed in the shell 10, and is disposed outside the upper body 20. As a result, the lower surface of the additional sole body 40 covers the inner surface 11a on the rear end side in the front-rear direction X of the bottom wall portion 11 of the shell 10, and the upper surface of the additional sole body 40 covers the outer surface 21b on the rear end side in the front-rear direction X of the lower wall portion 21 of the upper body 20. Further, the end surface of the additional sole body 40 (that is, the surface connecting the upper surface and the lower surface of the additional sole body 40) covers a part of the inner peripheral surface 12a on the lower end side in the vertical direction Z of the peripheral wall portion 12 of the shell 10.

[0050] In this way, in addition to the midsole 31 as the cushioning material included in the sole body 30 described above, by disposing the additional sole body 40 as the cushioning material having an elastic modulus different from that of the midsole 31 at a position corresponding to the rear foot portion R3, it is possible to more easily optimize the cushioning performance for the heel portion during landing.

[0051] That is, at the time of landing, particularly high foot pressure is applied to the sole of the shoe at the rear foot part R3. Therefore, in order to sufficiently relieve this foot pressure, it is necessary to enhance the cushioning performance of the cushioning material disposed in this part. In that case, considering that the above-described midsole 31 is configured by a single member that extends across the front foot part R1, the middle foot part R2, and the rear foot part R3, it is assumed that the thickness of the midsole 31 at the rear foot part R3 is increased compared to the thicknesses of the front foot part R1 and the middle foot part R2. However, when the thickness of the midsole 31 at the rear foot part R3 is increased, although it is necessary to obtain corresponding cushioning performance also at the front foot part R1 and the middle foot part R2, a problem occurs in that significant sinking of the heel part at the time of landing at the rear foot part R3 occurs, and particularly at a position corresponding to the toenail of the wearer's foot, a large gap is generated between the toenail and the upper body 20.

[0052] In this regard, as described above, by disposing the additional sole body 40 as a cushioning material having an elastic modulus different from that of the midsole 31 in addition to the midsole 31 as the cushioning material included in the sole body 30 at the rear foot part R3, it becomes possible to enhance the cushioning performance at the rear foot part R3 compared to the cushioning performance at the front foot part R1 and the middle foot part R2 while maintaining the necessary cushioning performance at the front foot part R1 and the middle foot part R2, and moreover, it is possible to suppress the occurrence of excessive sinking of the heel part at the time of landing. Therefore, as described above, it becomes possible to more easily optimize the cushioning performance with respect to the heel part at the time of landing, and as a result, it is possible to suppress the generation of a gap between the foot of the wearer and the upper body 20.

[0053] Here, the thickness of the additional sole body 40 is preferably greater than the thickness of the midsole 31, particularly in the portion that supports the wearer's heel. Also, the elastic modulus of the additional sole body 40 is preferably lower than the elastic modulus of the midsole 31. By configuring in this way, at the time of landing, it becomes possible to make the amount of deformation of the additional sole body 40 larger than the amount of deformation of the midsole 31. Therefore, while ensuring high cushioning performance, it is possible to reduce the gap that occurs between the wearer's foot and the upper body 20 as described above.

[0054] Further, in the present embodiment, as described above, the additional sole body 40 is disposed between the bottom wall portion 11 of the shell 10 and the lower wall portion 21 of the upper body 20. By configuring in this way, since the upper body 20 can be made smaller by the amount corresponding to not disposing the additional sole body 40 inside the upper body 20, it contributes to the weight reduction of the shoe 1A.

[0055] In addition, at the time of landing, particularly with a high foot pressure being applied to the shoe sole at the rear foot portion R3, the cushioning material in the portion located at the rear foot portion R3 is more likely to deteriorate than the cushioning material in the portions located at the front foot portion R1 and the mid foot portion R2, and there is a problem that the cushioning performance decreases due to long-term use. In this regard, as in the present embodiment, by dividing the cushioning material in the portion located at the rear foot portion R3 into the midsole 31 and the additional sole body 40, it becomes possible to replace only the additional sole body 40 that is more likely to deteriorate, and it becomes possible to use the shoe 1A for a longer period of time.

[0056] As shown in FIGS. 6 and 7, the heel counter 50 covers the peripheral surface of the wearer's heel (that is, the inner and outer ankles of the wearer's foot and the rear surface of the heel portion of the portion located between them), and is configured by a curved plate having a substantially C-shaped shape when viewed along the direction orthogonal to the ground contact surface 3. The heel counter 50 is a member for reinforcing the inner foot side peripheral wall portion 12A and the outer foot side peripheral wall portion 12B of the shell 10 in the portion corresponding to the rear foot portion R3, and the rear side peripheral wall portion 12C of the shell 10.

[0057] The heel counter 50 is composed of a member harder than the shell 10 and the upper body 20. The heel counter 50 includes a surrounding portion 51 that covers the peripheral surface of the wearer's heel, and a protruding portion 52 that continuously extends from the lower end of the surrounding portion 51.

[0058] The surrounding portion 51 has a first portion 51A that covers the inner-foot-side peripheral surface of the wearer's heel (i.e., the inner malleolus of the wearer's foot), a second portion 51B that covers the outer-foot-side peripheral surface of the wearer's heel (i.e., the outer malleolus of the wearer's foot), and a third portion 51C that connects the first portion 51A and the second portion 51B and covers the rear surface of the wearer's heel.

[0059] Accordingly, the first portion 51A of the surrounding portion 51 is positioned between and overlaps each of the inner-foot-side peripheral wall portion 12A of the shell 10 and the inner-foot-side wall portion 22A of the upper body 20. The second portion 51B of the surrounding portion 51 is positioned between and overlaps each of the outer-foot-side peripheral wall portion 12B of the shell 10 and the outer-foot-side wall portion 22B of the upper body 20. Also, the third portion 51C of the surrounding portion 51 is positioned between and overlaps each of the rear-side peripheral wall portion 12C of the shell 10 and the rear-side wall portion 22C of the upper body 20.

[0060] Therefore, since the peripheral surface of the wearer's heel is surrounded by the surrounding portion 51 of the heel counter 50, it is possible to suppress the shell 10 and the upper body 20 in the portion covering the peripheral surface of the wearer's heel from tilting in the left-right direction Y, and in particular, it becomes possible to ensure stability at the time of landing.

[0061] The protruding portion 52 extends from the lower end of the surrounding portion 51 toward the bottom wall portion 11 and protrudes toward the peripheral wall portion 12. More specifically, the protruding portion 52 is provided so as to continuously extend from any of the first portion 51A, the second portion 51B, and the third portion 51C of the surrounding portion 51, and thus the protruding portion 52 has a flare shape. This protruding portion 52 is a portion for fixing the heel counter 50 to the shell 10, but the details thereof will be described later.

[0062] In the shoe 1A according to the embodiment described above, the peripheral surface of the wearer's foot is covered by the upper body 20, and the sole of the wearer's foot is covered by the midsole 31 of the sole body 30. Therefore, when the wearer wears the shoe 1A, the wearer's foot comes into contact with the soft upper body 20 that can be flexibly deformed and the relatively soft sole body 30 that can be elastically deformed. Therefore, by adopting the above configuration, the shell 10 does not directly contact the wearer's foot, and the shoe 1A with a comfortable wearing feeling can be ensured.

[0063] However, the upper body 20 and the sole body 30 do not necessarily need to contact the wearer's foot entirely. In a range where the wearing comfort is not impaired, cutout shapes or openings such as cutout portions may be provided in the upper body 20 and the sole body 30.

[0064] <B. Materials of Each Member> Next, the materials of each member described above will be explained. Note that the specific materials shown below are merely examples and are not limited thereto.

[0065] The shell 10 may basically be made of any material as long as it has flexibility, but it preferably has appropriate strength. From this viewpoint, the shell 10 is preferably made of a resin material or a rubber material. Here, the material constituting the shell 10 may be a reactive one that starts a reaction by light (for example, ultraviolet light) or heat, and may be, for example, a polymer or a reactive monomer.

[0066] More specifically, when the shell 10 is made of resin, it can be, for example, a polyolefin resin, an ethylene-vinyl acetate copolymer (EVA), a polyamide-based thermoplastic elastomer (TPA, TPAE), a thermoplastic polyurethane (TPU), or a polyester-based thermoplastic elastomer (TPEE). On the other hand, when the shell 10 is made of rubber, it can be, for example, butadiene rubber.

[0067] The shell 10 can also be made of a polymer composition. In that case, examples of the polymer to be included in the polymer composition include olefin-based polymers such as olefin elastomers and olefin resins. Examples of olefin-based polymers include polyethylene (e.g., linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), etc.), polypropylene, ethylene-propylene copolymer, propylene-1-hexene copolymer, propylene-4-methyl-1-pentene copolymer, propylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-4-methyl-pentene copolymer, ethylene-1-butene copolymer, 1-butene-1-hexene copolymer, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer (EVA), polyolefins such as propylene-vinyl acetate copolymer, etc.

[0068] Also, the above polymer may be an amide-based polymer such as an amide elastomer or an amide resin. Examples of amide-based polymers include polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 610, etc.

[0069] Also, the above polymer may be an ester-based polymer such as an ester elastomer or an ester resin. Examples of ester-based polymers include polyethylene terephthalate, polybutylene terephthalate, etc.

[0070] Further, the polymer may be, for example, a urethane-based polymer such as a urethane elastomer or a urethane resin. Examples of the urethane-based polymer include polyester-based polyurethane, polyether-based polyurethane, etc., and urethane acrylate can be preferably used.

[0071] Further, the polymer may be, for example, a styrene-based polymer such as a styrene-based elastomer or a styrene-based resin. Examples of the styrene-based elastomer include styrene-ethylene-butylene copolymer (SEB), styrene-butadiene-styrene copolymer (SBS), hydrogenated product of SBS (styrene-ethylene-butylene-styrene copolymer (SEBS)), styrene-isoprene-styrene copolymer (SIS), hydrogenated product of SIS (styrene-ethylene-propylene-styrene copolymer (SEPS)), styrene-isobutylene-styrene copolymer (SIBS), styrene-butadiene-styrene-butadiene (SBSB), styrene-butadiene-styrene-butadiene-styrene (SBSBS), etc. Examples of the styrene-based resin include polystyrene, acrylonitrile styrene resin (AS), acrylonitrile butadiene styrene resin (ABS), etc.

[0072] Further, the polymer may be, for example, an acrylic polymer such as polymethyl methacrylate, a urethane-based acrylic polymer, a polyester-based acrylic polymer, a polyether-based acrylic polymer, a polycarbonate-based acrylic polymer, an epoxy-based acrylic polymer, a conjugated diene polymerization-based acrylic polymer and its hydrogenated product, a urethane-based methacrylic polymer, a polyester-based methacrylic polymer, a polyether-based methacrylic polymer, a polycarbonate-based methacrylic polymer, an epoxy-based methacrylic polymer, a conjugated diene polymerization-based methacrylic polymer and its hydrogenated product, a polyvinyl chloride-based resin, a silicone-based elastomer, butadiene rubber (BR), isoprene rubber (IR), chloroprene (CR), natural rubber (NR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), butyl rubber (IIR), etc.

[0073] Note that the manufacturing method of the shell 10 is not particularly limited, but the shell 10 can be manufactured, for example, by injection molding, casting, or molding using a three-dimensional lamination modeling apparatus. In particular, if the shell 10 is manufactured by molding using a three-dimensional lamination modeling apparatus, shells 10 with various structures that are difficult to manufacture by injection molding or casting can be manufactured. Also, even when adopting molding using a three-dimensional lamination modeling apparatus, the molding method is not particularly limited, but preferably, a thermal melting lamination modeling method, a stereolithography method, or a powder sintering lamination modeling method can be used.

[0074] The upper body 20 may basically be made of any material as long as it can be flexibly deformed, but preferably, a woven fabric, a knitted fabric, a non-woven fabric, synthetic leather, resin, etc. are used. More specifically, the upper body 20 can be constituted by, for example, natural fibers such as cotton, hemp, and silk, and also, for example, synthetic fibers made of polyamide resins such as nylon, polyester resins, polyurethane resins, polyvinyl alcohol resins such as vinylon, polyacrylonitrile resins such as exlan and cashmilon, polyvinyl chloride resins such as teviron and envilon, polypropylene resins such as pyren, polyethylene resins, polystyrene resins, etc. Also, the upper body 20 can be constituted by, for example, rayon or cupra as recycled fibers.

[0075] In particular, as will be described later, if a woven fabric, a knitted fabric, a non-woven fabric, etc. of synthetic fibers having heat shrinkability are used, the upper body 20 that fits better to the wearer's foot can be obtained. Examples of synthetic fibers having heat shrinkability include those mainly composed of, for example, polyester resins, polyurethane resins, etc., and particularly preferably, Hytrel (trademark), which is a type of polyester resin, can be mentioned.

[0076] That is, when the upper body 20 is made of a woven fabric, knitted fabric, non-woven fabric, etc. of synthetic fibers having heat shrinkability, it is formed into a bag shape in advance, and heat treatment is performed in a state where a last is inserted therein. By heat shrinking due to heating, the upper body 20 undergoes a shape change to a state where it adheres closely to the last, and the shape after the change is maintained. Therefore, if a last corresponding to the shape of the wearer's foot is prepared and the upper body 20 is molded using the same, an upper body 20 that fits the wearer's foot can be manufactured. Furthermore, if the heat treatment using the above-described last is performed in a state where the upper body 20 is incorporated into the shell 10, the upper body 20 will also fit the shell 10, and further improvement in fit can be achieved.

[0077] As the above-described last, a standard-shaped one corresponding to the size of the wearer's foot may be used. However, if a last manufactured based on the foot shape data obtained by measuring the actual wearer's foot is used, the fit of the manufactured shoe 1A to the wearer's foot will be significantly improved.

[0078] The midsole 31 and the additional sole body 40 may basically be made of any material as long as they can be elastically deformed, but it is preferable that they are made of members having appropriate strength and excellent cushioning properties. From this perspective, as the midsole 31 and the additional sole body 40, for example, a resin foam material containing a resin material as a main component and a foaming agent or a crosslinking agent as a sub-component is used. Alternatively, a rubber foam material containing a rubber material as a main component and a plasticizer, a foaming agent, a reinforcing agent, and a crosslinking agent as sub-components may be used.

[0079] Particularly preferably, the midsole 31 and the additional sole body 40 can be made of a foamed material such as a polyolefin resin, an ethylene-vinyl acetate copolymer (EVA), a polyamide-based thermoplastic elastomer (TPA, TPAE), a thermoplastic polyurethane (TPU), or a polyester-based thermoplastic elastomer (TPEE). Note that the midsole 31 and the additional sole body 40 do not necessarily have to be made of a foamed material, and they may be made of a non-foamed material instead.

[0080] The plate 32 only needs to be made of a material harder than the material constituting the midsole 31, and its material is not particularly limited. Examples of the material of the plate 32 include fiber-reinforced resins using carbon fiber, glass fiber, aramid fiber, Dyneema fiber (registered trademark), Zylon fiber (registered trademark), boron fiber, etc. as reinforcing fibers and using epoxy resin, polyester resin, phenolic resin, polyamide resin, polypropylene resin, polyethylene resin, polyurethane resin, etc. as the base material, and non-fiber-reinforced resins made of polymer resins such as urethane-based thermoplastic elastomer (TPU), amide-based thermoplastic elastomer (TPA), and ethylene-vinyl acetate copolymer (EVA).

[0081] The heel counter 50 only needs to be made of a material harder than the material constituting the shell 10, and its material is not particularly limited. Examples of the material of the heel counter 50 include polymer resins such as urethane-based thermoplastic elastomer (TPU), amide-based thermoplastic elastomer (TPA), ethylene-vinyl acetate copolymer (EVA), and thermosetting urethane elastomer (TSU), and thermoplastic rubber.

[0082] Note that the manufacturing method of the heel counter 50 is not particularly limited, but the heel counter 50 can be manufactured, for example, by injection molding, casting molding, or molding using a three-dimensional laminating apparatus. In particular, if the heel counter 50 is manufactured by molding using a three-dimensional laminating apparatus, heel counters 50 with various structures that are difficult to manufacture by injection molding or casting molding can be manufactured. Further, even when adopting the molding using a three-dimensional laminating apparatus, the molding method is not particularly limited, but preferably, a thermal melting lamination molding method, a stereolithography method, or a powder sintering lamination molding method can be used.

[0083] <C. Schematic Assembly Method of Shoes> Next, with reference to FIG. 8 described above, a schematic assembly method of the shoe 1A according to the present embodiment will be described.

[0084] As shown in FIG. 8, the shoe 1A according to the present embodiment is manufactured by mutually assembling a shell 10, an upper body 20, a midsole 31, a plate 32, an additional sole body 40, and a heel counter 50. These shell 10, upper body 20, midsole 31, plate 32, additional sole body 40, and heel counter 50 may be manufactured by any method.

[0085] Specifically, first, the additional sole body 40 and the heel counter 50 are inserted into the internal space of the shell 10. Here, since the shell 10 has flexibility, the additional sole body 40 can also be elastically deformed, and the heel counter 50 can also be flexibly deformed, so the additional sole body 40 and the heel counter 50 can be inserted into the shell 10 through the mouth portion 10a provided at the upper end of the shell 10. The additional sole body 40 inserted into the shell 10 is arranged along the inner surface 11a on the rear end side in the front-rear direction X of the bottom wall portion 11 of the shell 10. Further, the heel counter 50 inserted into the shell 10 is arranged along the inner peripheral surface 12a on the rear end side in the front-rear direction X of the peripheral wall portion 12 of the shell 10.

[0086] Next, the upper body 20 is inserted into the internal space of the shell 10. Here, since the shell 10 has flexibility and the upper body 20 can also be flexibly deformed, the upper body 20 can be inserted into the shell 10 through the mouth portion 10a provided at the upper end of the shell 10. The upper body 20 inserted into the shell 10 is arranged along the inner surface 11a of the bottom wall portion 11 and the inner peripheral surface 12a of the peripheral wall portion 12 of the shell 10. Further, the upper end portion of the side wall portion 22 of the portion defining the opening 20a is in a state of being drawn out from the mouth portion 10a of the shell 10 toward the outside. At this time, the upper surface of the additional sole body 40 and the inner peripheral surface of the heel counter 50 previously accommodated in the shell 10 will be covered by the upper body 20.

[0087] Next, the sole body 30 including the midsole 31 and the plate 32 is inserted into the internal space of the shell 10 by being inserted into the upper body 20. The midsole 31 and the plate 32 may be individually inserted into the upper body 20, or they may be inserted into the upper body 20 together. Here, although the midsole 31 can be elastically deformed, the plate 32 is relatively rigid and does not easily deform in its in-plane direction. However, since the upper body 20 can be flexibly deformed and the shell 10 also has flexibility, the sole body 30 including the midsole 31 and the plate 32 can be inserted into the upper body 20 through the opening 20a provided at the upper end of the upper body 20. At this time, the insertion of the midsole 31 and the plate 32 is not hindered by the mouth portion 10a provided at the upper end of the shell 10. The sole body 30 including the midsole 31 and the plate 32 inserted into the upper body 20 is arranged along the inner surface 21a of the lower wall portion 21 of the upper body 20. Thereby, the sole body 30 is arranged at an appropriate position in the internal space of the shell 10.

[0088] By going through the above assembly procedure, the mutual assembly of the shell 10, the upper body 20, the midsole 31, the plate 32, the additional sole body 40, and the heel counter 50 is completed, and thereby the manufacturing of the shoe 1A according to the present embodiment described above is completed. Note that the above-described assembly method is merely an example, and other assembly methods (for example, other assembly procedures, the arrangement positions of the respective members different from the above, etc.) may be adopted.

[0089] <D. Parentheses> Thus, the shoe 1A according to the present embodiment can be manufactured by a very simple operation of mutually assembling the shell 10, the upper body 20, the sole body 30, the additional sole body 40, and the heel counter 50 that are individually manufactured in advance, and therefore its manufacturing is facilitated as compared with the prior art. In the shoe 1A according to the present embodiment, when the shell 10, the upper body 20, the sole body 30, the additional sole body 40, and the heel counter 50 are mutually assembled, they are configured such that the fixing can be easily performed. Moreover, the use of an adhesive is not required for the assembly of the midsole 31, the plate 32, the additional sole body 40, and the heel counter 50 to the shell 10 and the upper body 20. These points will be described in detail later.

[0090] <E. Fixing Structure of the Sole Body to the Shell> FIG. 9 is an enlarged view of the region IX shown in FIG. 6, and FIG. 10 is an enlarged cross-sectional view of the main part of the shoe shown in FIG. 1. FIG. 11 is a partially broken perspective view of the shell shown in FIG. 1 taken along the line XI-XI shown in FIG. 3. Further, FIG. 12 is a schematic diagram showing the formation range of the pressing surface provided on the peripheral wall portion of the shell shown in FIG. 1. Next, with reference to FIGS. 9 to 12 and FIGS. 6 and 7 described above, the fixing structure of the sole body 30 to the shell 10 in the shoe 1A according to the present embodiment will be described in detail.

[0091] Here, FIGS. 9 and 10 are both cross-sectional views when the shoe 1A is cut along a plane orthogonal to the shoe center SC. The cross-section shown in FIG. 9 is the cross-section of the shoe 1A at the portion where the heel counter 50 is disposed, while the cross-section shown in FIG. 10 is the cross-section of the portion where the heel counter 50 is not disposed. More specifically, the cross-section shown in FIG. 9 is the cross-section at the rear foot portion R3, and the cross-section shown in FIG. 10 is the cross-section at the midfoot portion R2. Further, in FIG. 12, the illustration of the detailed structure of the shoe 1A is omitted, and the formation range of the pressing surface 14 is shown by coloring the range where the pressing surface 14 is formed in a dark color when viewed from the upper side along the vertical direction Z.

[0092] As shown in FIGS. 6, 7, and 9 to 11, in the shoe 1A according to the present embodiment, a constricted portion 13A is provided on the peripheral wall portion 12 of the shell 10. The constricted portion 13A is formed by constricting a predetermined portion of the peripheral wall portion 12 toward the inside of the shell 10 (that is, toward the insertion space SP3 side). As a result, the inner peripheral surface 12a of the peripheral wall portion 12 at the portion where the constricted portion 13A is provided protrudes toward the inside of the shell 10, while a depression is formed on the outer peripheral surface 12b of the peripheral wall portion 12 at the portion where the constricted portion 13A is provided.

[0093] The constricted portion 13A extends along the circumferential direction of the peripheral wall portion 12. More specifically, the constricted portion 13A extends from the rear end side portion in the front-rear direction X of the inner foot side peripheral wall portion 12A of the portion included in the front foot portion R1 along the circumferential direction of the peripheral wall portion 12, passes through the rear end position PR (see FIG. 7, etc.) on the rear side, and extends to the rear end side portion in the front-rear direction X of the outer foot side peripheral wall portion 12B of the portion included in the front foot portion R1.

[0094] Here, by providing the constricted portion 13A described above on the peripheral wall portion 12, the inner peripheral surface 12a of the peripheral wall portion 12 includes a surface that extends toward the inside of the shell 10 and faces the bottom wall portion 11 side. The surface of the peripheral wall portion 12 that faces the bottom wall portion 11 side corresponds to the lower surface of the constricted portion 13A, and the lower surface of the constricted portion 13A functions as a pressing surface 14 for fixing the sole body 30. That is, in the shoe 1A according to the present embodiment, the end portion of the sole body 30 is inserted into the space below the portion where the constricted portion 13A is provided, so that the sole body 30 is sandwiched between the pressing surface 14 and the bottom wall portion 11, whereby the sole body 30 is fixed to the shell 10.

[0095] As described above, in the shoe 1A according to the present embodiment, since the constricted portion 13A is provided so as to extend along the circumferential direction of the peripheral wall portion 12, the above-described pressing surface 14 is also positioned so as to extend along the circumferential direction of the peripheral wall portion 12.

[0096] That is, as shown in FIG. 12, the pressing surface 14 extends along the circumferential direction of the peripheral wall portion 12 from the rear end side portion in the front-rear direction X of the inner foot side peripheral wall portion 12A of the portion included in the front foot portion R1, via the rear end position PR, to the rear end side portion in the front-rear direction X of the outer foot side peripheral wall portion 12B of the portion included in the front foot portion R1. Therefore, the pressing surface 14 includes an inner foot side pressing surface 14A provided on the inner foot side peripheral wall portion 12A, an outer foot side pressing surface 14B provided on the outer foot side peripheral wall portion 12B, and a rear side pressing surface 14C provided on the rear side peripheral wall portion 12C, and these inner foot side pressing surface 14A, outer foot side pressing surface 14B, and rear side pressing surface 14C extend continuously with each other along the circumferential direction of the peripheral wall portion 12.

[0097] As a result, the sole body 30 will be sandwiched between each of these inner foot side pressing surfaces 14A, outer foot side pressing surfaces 14B, and rear side pressing surfaces 14C and the bottom wall portion 11. Therefore, the sole body 30 will be held by the shell 10 in the vertical direction Z at both ends in the left - right direction Y, and will also be held by the shell 10 in the vertical direction Z at the rear end in the front - rear direction X.

[0098] Therefore, by adopting the above configuration, the sole body 30 can be stably fixed to the shell 10, and it is possible to effectively suppress the sole body 30 from shifting inside the shell 10 during use. Therefore, by adopting the above configuration, it is possible to obtain the shoe 1A with significantly improved fit for the wearer's foot and stability during landing. Also, since the pressing surface 14 for fixing the sole body 30 can be integrally provided on the shell 10 during the manufacture of the shell 10, it is also possible to reduce the number of parts and simplify the manufacturing process.

[0099] Note that the pressing surface 14 including the above - described inner foot side pressing surface 14A, outer foot side pressing surface 14B, and rear side pressing surface 14C is located so as to extend long along the circumferential direction of the peripheral wall portion 12, while the protruding amount toward the inside of the shell 10 is configured to be relatively small. By configuring in this way, the operation of fitting the end portion of the sole body 30 into the space below the pressing surface 14 is facilitated, and more stable fixing of the sole body 30 becomes possible because more portions of the sole body 30 are held by the shell 10.

[0100] Here, the fixing structure of the sole body 30 to the shell 10 described above can stably fix the sole body 30 to the shell 10 without using an adhesive, and in this regard, the amount of organic solvent used can be significantly reduced compared to the case of performing these fixings using an adhesive. Therefore, by adopting the above configuration, it is possible to reduce the environmental load compared to the conventional case.

[0101] Since the shell 10 has flexibility as described above, when assembling the sole body 30 to the shell 10, the end portion of the sole body 30 can be easily inserted into the space below the portion where the constricted portion 13A is provided because the shell 10 is flexed and deformed. Therefore, by adopting the above configuration, the assembly of the sole body 30 to the shell 10 is not difficult, and the assembly can be easily performed.

[0102] In addition, in the shoe 1A according to the present embodiment, the pressing surface 14 is not provided on the front end side portions in the front - rear direction X of the inner - foot - side peripheral wall portion 12A and the outer - foot - side peripheral wall portion 12B of the portion included in the front foot portion R1 and the front - side peripheral wall portion 12D. This is because the foot pressure applied to the sole body 30 at the time of landing is large at the rear foot portion R3, while it is relatively small at the front foot portion R1. Therefore, if the sole body 30 is stably fixed to the shell 10 at the rear foot portion R3 and the middle foot portion R2, the corresponding effects can be obtained. Also, since the portion of the internal space of the shell 10 corresponding to the front foot portion R1 is located deeper from the opening edge 2, it is assumed that the assembly of the sole body 30 to the shell 10 becomes complicated when the pressing surface 14 is provided in this portion, and this is also to avoid this. However, it is of course possible to provide the pressing surface 14 on the front end side portions in the front - rear direction X of the inner - foot - side peripheral wall portion 12A and the outer - foot - side peripheral wall portion 12B of the portion included in the front foot portion R1 and the front - side peripheral wall portion 12D.

[0103] In addition, in the shoe 1A according to the present embodiment, the pressing surface 14 has an inclined - surface shape in which the protruding amount increases as it goes upward in the vertical direction Z, and the mid - sole 31 is configured to have a substantially trapezoidal cross - sectional shape so that the above - described peripheral surface of the sole body 30 (that is, the portion of the sole body 30 facing the lower - end side portion of the inner - peripheral surface 22a of the side - wall portion 22 of the upper body 20) also has a corresponding inclined - surface shape. By configuring in this way, while realizing stable fixing of the sole body 30 by the pressing surface 14, the assembly of the sole body 30 to the shell 10 can be easily performed.

[0104] Note that the pressing surface 14 does not necessarily have to be configured in an inclined surface shape in which the protruding amount increases as it goes upward in the vertical direction Z as described above. It may be configured in an inclined surface shape in which the protruding amount increases as it goes downward in the vertical direction Z, or may be configured in a horizontal surface shape extending in the left-right direction Y.

[0105] Here, when the pressing surface 14 is configured in an inclined surface shape in which the protruding amount increases as it goes upward in the vertical direction Z as described above, the smaller the angle formed by the pressing surface 14 of the inclined surface shape and the horizontal plane, the greater the fixing force with respect to the sole body 30. On the other hand, when the pressing surface 14 is configured in an inclined surface shape in which the protruding amount increases as it goes downward in the vertical direction Z, the greater the angle formed by the pressing surface 14 of the inclined surface shape and the horizontal plane, the greater the fixing force with respect to the sole body 30.

[0106] As described above, in the shoe 1A according to the present embodiment, the sole body 30 includes a midsole 31 and a plate 32, and the plate 32 is laminated with the midsole 31 by being disposed at a position below the midsole 31 in the vertical direction Z. Therefore, by adopting the above configuration, not only the midsole 31 but also the plate 32 can be held by the shell 10. Even if the midsole 31 and the plate 32 are not adhered to each other, these midsole 31 and plate 32 can be stably fixed to the shell 10 at the same time.

[0107] Also, as described above, in the shoe 1A according to the present embodiment, the upper body 20 is housed in the shell 10, and further, the sole body 30 is housed inside the upper body 20. Therefore, as shown in FIGS. 9 and 10, the sole body 30 is sandwiched between the pressing surface 14 and the bottom wall portion 11 with the upper body 20 intervening therebetween. Even in a configuration where the sole body 30 does not directly contact the pressing surface 14, since the upper body 20 is made of a sufficiently flexible member, the sole body 30 can be stably fixed to the shell 10 via the upper body 20.

[0108] Also, as described above, in the shoe 1A according to the present embodiment, the heel counter 50 is located at the rear foot portion R3, and the heel counter 50 is housed in the shell 10 and disposed outside the upper body 20. Therefore, as shown in FIG. 9, the sole body 30 is sandwiched between the pressing surface 14 and the bottom wall portion 11 with the flare-shaped protruding portions 52 of the upper body 20 and the heel counter 50 intervening therebetween. Even in a configuration where the sole body 30 does not directly contact the pressing surface 14, since the upper body 20 is made of a sufficiently flexible member and the shape of the protruding portion 52 of the heel counter 50 corresponds to the shape of the pressing surface 14 and the peripheral surface shape of the sole body 30, the sole body 30 can be stably fixed to the shell 10 via the upper body 20 and the heel counter 50. By adopting this configuration, it is also possible to stably fix the heel counter 50 to the shell 10, but this point will be described in detail later.

[0109] Furthermore, as described above, in the shoe 1A according to the present embodiment, the additional sole body 40 is positioned across the midfoot region R2 and the hindfoot region R3, and the additional sole body 40 is housed in the shell 10 and disposed outside the upper body 20. Here, the lower wall portion 21 of the upper body 20 covers the second main surface 32b of the plate 32 which is the lower surface of the sole body 30, and the additional sole body 40 is disposed between the lower wall portion 21 of the upper body 20 and the bottom wall portion 11. Therefore, the additional sole body 40 is sandwiched and held by the sole body 30 fixed by the pressing surface 14 and the bottom wall portion 11, and thereby is fixed to the shell 10. Therefore, by configuring in this way, it becomes possible to stably fix the sole body 30 and the additional sole body 40 to the shell 10 simultaneously.

[0110] <F. Fixing Structure of Sole Body to Upper Body> FIG. 13 is a schematic diagram for explaining the fixing structure of the sole body to the upper body in the shoe shown in FIG. 1, and FIG. 14 is a schematic cross-sectional view taken along the line XIV-XIV shown in FIG. 13. Further, FIG. 15 is a schematic perspective view showing only the upper body of the shoe shown in FIG. 1. Next, with reference to FIGS. 13 to 15 and the aforementioned FIGS. 5 and 7, the fixing structure of the sole body 30 to the upper body 20 in the shoe 1A according to the present embodiment will be described in detail.

[0111] Here, FIG. 13 is a plan view of the upper body 20 and the sole body 30 accommodated therein when viewed from above along the vertical direction Z. In FIG. 13, the side wall portion 22 of the portion defining the above-described insertion space SP3 (that is, the side wall portion 22 of the portion of the upper body 20 not covered by the sole body 30) is shown in a state where it is removed (the same applies to FIGS. 19 and 20). Further, in FIG. 13, for ease of understanding, the exposed portion of the sole body 30 is colored dark (the same applies to FIGS. 17, 19, and 20). On the other hand, in FIG. 15, the belt-like portion 23 provided inside the upper body 20 is schematically shown by a broken line, and for further ease of understanding, the belt-like portion 23 is colored dark.

[0112] As shown in FIGS. 5, 7, and 13 to 15, in the shoe 1A according to the present embodiment, a belt-like portion 23 is provided inside the upper body 20. This belt-like portion 23 is for fixing the sole body 30 to the upper body 20 and is constituted by, for example, a band made of a woven fabric of synthetic fiber or the like. One end 23a in the extending direction of the belt-like portion 23 is connected to the inner side wall portion 22A, and the other end 23b in the extending direction thereof is connected to the outer side wall portion 22B. Further, between one end 23a and the other end 23b of the belt-like portion 23, a holding portion 23c is located so as to connect them.

[0113] More specifically, one end 23a of the belt-like portion 23 is bent along the inner peripheral surface 22a of the inner side wall portion 22A, and this bent portion is attached to the inner side wall portion 22A by, for example, sewing or the like. Further, the other end 23b of the belt-like portion 23 is bent along the inner peripheral surface 22a of the outer side wall portion 22B, and this bent portion is attached to the outer side wall portion 22B by, for example, sewing or the like.

[0114] As a result, the holding portion 23c, which is the portion located between one end 23a and the other end 23b of the strip portion 23, is positioned so as to bridge the inner foot side wall portion 22A and the outer foot side wall portion 22B along the left - right direction Y. Further, the holding portion 23c is positioned at a distance from the lower wall portion 21 by the thickness of the sole body 30 (that is, the dimension in the up - down direction Z of the sole body 30).

[0115] Here, in the present embodiment, two of these strip portions 23 are arranged at intervals in the front - rear direction X. One strip portion 23 is located at a portion closer to the rear end in the front - rear direction X of the front foot portion R1, and the other strip portion 23 is located at substantially the center in the front - rear direction X of the middle foot portion R2. Both of these two strip portions 23 extend along the left - right direction Y (that is, the direction orthogonal to the shoe center SC).

[0116] The sole body 30 is inserted between the above - described two strip portions 23 and the lower wall portion 21, and thereby the sole body 30 is fixed to the upper body 20 by being sandwiched between the lower wall portion 21 and the strip portions 23.

[0117] Therefore, by adopting the above configuration, the sole body 30 can be stably fixed to the upper body 20, and it is possible to effectively suppress the sole body 30 from being displaced inside the upper body 20 during use. Therefore, by adopting the above configuration, it is possible to make the shoe 1A with significantly improved fit to the wearer's foot and stability during landing.

[0118] Here, the fixing structure of the sole body 30 to the upper body 20 described above can stably fix the sole body 30 to the upper body 20 without using an adhesive. In this regard, compared with the case of performing this fixing using an adhesive, the amount of organic solvent used can be significantly reduced. Therefore, by adopting the above configuration, the environmental load can be reduced compared to the conventional case.

[0119] Moreover, by adopting the above configuration, it is possible to suppress the generation of a gap between the upper body 20 and the sole body 30 (more precisely, between the inner peripheral surface 22a of the side wall portion 22 of the upper body 20 and the above-described peripheral surface of the sole body 30). Hereinafter, this point will be described in detail.

[0120] FIG. 16 is a cross-sectional view of the upper body and sole of a shoe according to a comparative example. Here, the shoe 1X according to the comparative example is a case where the belt-like portion 23 provided in the upper body 20 of the shoe 1A according to the above-described present embodiment is not provided.

[0121] As shown in FIG. 16, when the belt-like portion 23 is not provided in the upper body 20, the sole body 30 is merely disposed on the lower wall portion 21 of the upper body 20, and no special fixing is performed on the upper body 20. In that case, as described above, the upper body 20 can be flexibly deformed, and the shell 10 (not shown in FIG. 16) disposed outside the upper body 20 also has flexibility. Therefore, the inner foot side wall portion 22A of the upper body 20 and the inner foot side peripheral wall portion 12A of the shell 10 positioned so as to overlap therewith, and the outer foot side wall portion 22B of the upper body 20 and the outer foot side peripheral wall portion 12B of the shell 10 positioned so as to overlap therewith are difficult to maintain their shapes, and these portions are not maintained in a state where they are applied to the above-described peripheral surface of the sole body 30.

[0122] Therefore, as shown in FIG. 16, these portions are likely to fall in the left-right direction Y, and a gap G is generated between the upper body 20 and the sole body 30 at this portion. As a result, during use, the fit of the shoe to the wearer's foot and the stability at the time of landing are significantly impaired. In addition, such a gap G may occur even in the initial state after the completion of the manufacture of the shoe including the shell, the upper body, and the sole body, etc. and at the stage where the shoe is not used, and furthermore, there is a possibility that the gap G may expand due to the use of the shoe, and there is concern that the shoe 1X will lack fit and stability.

[0123] On the other hand, as shown in FIGS. 13 to 15, in the shoe 1A according to the present embodiment, since the belt-like portion 23 that connects the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 is provided as described above, it is possible to suppress the inner foot side wall portion 22A and the outer foot side wall portion 22B from falling outward in the left-right direction Y. Therefore, by adopting the above-described configuration, also in this sense, it is possible to obtain the shoe 1A in which the fitness for the wearer's foot and the stability at the time of landing are significantly improved.

[0124] Here, the belt-like portion 23 is preferably formed of a non-elastic member or a low-elastic member. By configuring the belt-like portion 23 in this way with a non-elastic or low-elastic member, not only can the sole body 30 be more firmly fixed to the upper body 20, but also the fall of the inner foot side wall portion 22A and the outer foot side wall portion 22B outward in the left-right direction Y can be surely suppressed. Here, when the belt-like portion 23 is formed of a low-elastic member, it is preferable that the belt-like portion 23 is formed of a member having lower elasticity than the members constituting the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 to which one end 23a and the other end 23b of the belt-like portion 23 are attached.

[0125] However, even when the belt-like portion 23 is formed of a member having a considerably high elasticity, if the elastic force hardly deteriorates over time, the effect of fixing the sole body 30 to the upper body 20 can be correspondingly obtained. Therefore, the belt-like portion 23 does not necessarily have to be formed of a non-elastic or low-elastic member.

[0126] <G. Installation Position and Shape of Belt-Like Portion, etc.> FIG. 17 is a schematic view showing the position where the strip portion is to be provided and the relationship between the shape of the strip portion and the shape of the sole body. Next, with reference to FIG. 17, the position where the strip portion 23 is to be provided and the relationship between the shape of the strip portion 23 and the shape of the sole body 30 will be described. In FIG. 17, the strip portion 23 is shown in a developed state before one end 23a and the other end 23b thereof are attached to the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20.

[0127] As shown in FIG. 17, in the shoe 1A according to the present embodiment, as described above, two strip portions 23 are arranged at intervals in the front-rear direction X. One of them is located at a portion closer to the rear end in the front-rear direction X of the front foot portion R1, and the other of them is located substantially at the center in the front-rear direction X of the middle foot portion R2 (see FIG. 13).

[0128] Here, the position where the strip portion 23 is provided can be determined from the viewpoint of the shape of the wearer's foot.

[0129] That is, based on this viewpoint, as the position where the strip portion 23 is to be provided, when a virtual plane passing through the position of 45% of the total length of the insertion space SP3 from the front end position PF and orthogonal to the shoe center SC is defined as the first virtual plane VP1, and a virtual plane passing through the position of 80% of the total length of the insertion space SP3 from the front end position PF and orthogonal to the shoe center SC is defined as the second virtual plane VP2, the region Q1 from the first virtual plane VP1 to the second virtual plane VP2 is included.

[0130] The region Q1 usually corresponds to the stepping portion of the wearer's foot. In the region Q1, a space is likely to be generated between the sole of the wearer's foot and the sole body 30, and accordingly, the sole body 30 is likely to be displaced during walking or running. In particular, the sole of the inner foot side portion of the stepping portion of the wearer's foot is at a higher position compared to the soles of other parts, so the above-mentioned space is likely to be generated in the vertical direction Z.

[0131] Therefore, by installing the strip portion 23 in the region Q1, the displacement of the sole body 30 can be effectively suppressed as compared with the case where the strip portion 23 is installed in other portions. Here, the strip portion 23 may be arranged so as to fit within the region Q1, or only a part of it may be arranged so as to fit within the region Q1. In the present embodiment, among the two strip portions 23 described above, the strip portion 23 arranged behind in the front-rear direction X (that is, the strip portion 23 arranged substantially at the center in the front-rear direction X of the middle foot portion R2) corresponds to the strip portion installed in the region Q1.

[0132] Furthermore, when the virtual plane passing through the position 65% of the total length of the insertion space SP3 from the front-end position PF and orthogonal to the shoe center SC is defined as the third virtual plane VP3, it is still preferable that at least a part of the strip portion 23 is arranged so as to fit within the region Q2 from the first virtual plane VP1 to this third virtual plane VP3. The region Q2 is a region where a gap is likely to occur particularly between the sole of the wearer's foot among the regions Q1 described above.

[0133] Also, the position where the strip portion 23 is provided may be determined from the viewpoint of the relationality of the shapes of the shell 10, the upper body 20, and the sole body 30.

[0134] That is, on the plane orthogonal to the shoe center SC, the highest position of the portion covered by the inner foot side peripheral wall portion 12A and the outer foot side peripheral wall portion 12B of the shell 10 among the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 is set as HP1, and the lowest position of the top surface 31a of the midsole 31 that defines the upper surface of the sole body 30 is set as HP2. When comparing these HP1 and HP2, if HP1 is sufficiently higher than HP2, the necessity of providing the strip portion 23 in the portion including the plane is low. However, if HP1 is higher than HP2 but the difference is small, or if HP1 and HP2 are the same, or if HP2 is higher than HP1, it is preferable to provide the strip portion 23 in the portion including the plane.

[0135] When HP1 is sufficiently higher than HP2, the sole body 30 is surrounded by the shell 10 via the upper body 20 and is appropriately constrained by the shell 10. Therefore, it is difficult for the sole body 30 to be displaced. On the other hand, when HP1 is higher than HP2 but the difference is small, or when HP1 and HP2 are the same, or when HP2 is higher than HP1, the sole body 30 is hardly constrained by the shell 10 and is likely to be displaced.

[0136] Therefore, it is preferable to determine the position where the belt-like portion 23 is provided based on either or both of these viewpoints. For example, in a sock-like shoe such as the present embodiment where the height of the peripheral wall portion 12 of the shell 10 is set relatively high, it is preferable to determine the position where the belt-like portion 23 is provided particularly based on the former viewpoint. Although the upper body 20 is accommodated in the shell 10, in a shoe such as a sandal where the height of the peripheral wall portion 12 of the shell 10 is relatively low, it is preferable to determine the position where the belt-like portion 23 is provided particularly based on the latter viewpoint.

[0137] As shown in FIG. 17, in the shoe 1A according to the present embodiment, in the unfolded state before one end 23a and the other end 23b of the belt-like portion 23 are attached to the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20, the one end 23a and the other end 23b of the belt-like portion 23 extend in a predetermined direction different from the extending direction of the holding portion 23c of the belt-like portion 23 (that is, in the left-right direction Y in the present embodiment). That is, one end 23a and the other end 23b of the belt-like portion 23 are bent at a predetermined angle with respect to the holding portion 23c of the belt-like portion 23.

[0138] This is because when one end 23a and the other end 23b of the belt-like portion 23 are respectively attached to the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 so that the sole body 30 is sandwiched between the lower wall portion 21 of the upper body 20 and the belt-like portion 23, the one end 23a and the other end 23b of the belt-like portion 23 are arranged to bend along the peripheral surface of the sole body 30 as a result. This is the result considering this point.

[0139] That is, in order to stably fix the sole body 30, it is preferable that one end 23a and the other end 23b of the belt-like portion 23 extend along the vertical direction Z after the assembly of the belt-like portion 23. However, since the outer contour line of the upper surface of the sole body 30 (that is, the top surface 31a of the midsole 31) has a curved shape in plan view as shown in the drawing, if the bent shape as described above is not given to the belt-like portion 23, as a result, the holding portion 23c of the belt-like portion 23 will be loosened.

[0140] In this regard, in the shoe 1A according to the present embodiment, one end 23a and the other end 23b of the belt-like portion 23 have a shape bent in a predetermined direction in accordance with the shape of the sole body 30 at the portions where the one end 23a and the other end 23b are applied in the above-described unfolded state. Therefore, in the state where these one end 23a and the other end 23b are bent, they extend along the vertical direction Z, and the bending also prevents the holding portion 23c from loosening.

[0141] Therefore, by configuring in this way, the sole body 30 can be stably fixed to the upper body 20, and it is possible to more effectively suppress the sole body 30 from being displaced inside the upper body 20 during use.

[0142] <Another aspect of the shell> FIG. 18 is a perspective view showing another aspect of the shell of the shoe shown in FIG. 1. Hereinafter, with reference to this FIG. 18, another aspect of the shell 10 of the shoe 1A according to the present embodiment will be described.

[0143] In the present embodiment, as an example, the case where the shell 10 provided in the shoe 1A is of the type shown in FIGS. 1 to 4 and the like has been described. However, as the shell 10, various types can be used as long as they have flexibility. As an example, a shell 10A as shown in FIG. 18 may be used.

[0144] The shell 10A shown in FIG. 18 is configured with a three-dimensional mesh structure for the portion excluding the above-described mesh-like structure portion 10b. Here, the three-dimensional mesh structure is formed by repeatedly arranging a plurality of predetermined unit structures adjacent to each other, and such a three-dimensional structure like this three-dimensional mesh structure is also referred to as a lattice structure or a three-dimensional lattice structure. More specifically, the three-dimensional mesh structure includes a plurality of wire elements connected so as to intersect each other, and thus has intersection points formed by the intersection of the wire elements and hole portions 10c located between adjacent wire elements.

[0145] Therefore, when the shell 10A is configured with a three-dimensional mesh structure in this way, innumerable hole portions 10c are formed so as to reach the inner surface (that is, the inner surface 11a of the bottom wall portion 11 and the inner peripheral surface 12a of the peripheral wall portion 12) and the outer surface (that is, the outer surface 11b of the bottom wall portion 11 and the outer peripheral surface 12b of the peripheral wall portion 12). Note that the shell 10A having such a structure can be manufactured relatively easily, particularly by shaping using the above-described three-dimensional laminated modeling apparatus.

[0146] By configuring the shell 10A with a three-dimensional mesh structure in this way, the shell 10A has sufficient strength while also having appropriate flexibility, and moreover, the weight reduction and breathability improvement of the shoe 1A can be achieved. In addition, since the upper body 20 housed in the internal space of the shell 10A can be visually recognized from the outside through the innumerable hole portions 10c, the design property can also be improved.

[0147] Note that the shell 10A described above is configured with a three-dimensional mesh structure (that is, a three-dimensional lattice structure) for the portion excluding the above-described mesh-like structure portion 10b, but this portion may be configured with a structure having a solid wall structure instead of this three-dimensional mesh structure.

[0148] Here, the three-dimensional wall structure has a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel curved surfaces or planes as a unit structure, and a plurality of such unit structures are repeatedly arranged adjacent to each other. Specific examples in that case include, for example, those obtained by adding thickness to a triply periodic minimal surface such as a gyroid structure, Schwarz P structure, Schwarz D structure, etc., or those obtained by adding thickness to an octet structure, cubic structure, Kelvin structure, etc.

[0149] Alternatively, a part of the shell may be configured as a three-dimensional mesh structure (i.e., a three-dimensional lattice structure), and another part of the shell may be configured as a structure having a three-dimensional wall structure.

[0150] Furthermore, when at least a part of the shell is configured as a three-dimensional mesh structure, for example, the thickness of the wire elements described above may be partially changed, or the size of the unit structure may be partially changed. By configuring in this way, changes can be made to the physical properties (such as rigidity) of each part of the shell. Also, when at least a part of the shell is configured as a structure having a three-dimensional wall structure, for example, the thickness of the wall described above may be partially changed, or the size of the unit structure may be partially changed. By configuring in this way, changes can be made to the physical properties (such as rigidity) of each part of the shell.

[0151] (First to Fourth Modification Examples) FIG. 19 is a schematic diagram for explaining the fixing structure of the sole body to the upper body in the shoes according to the first and second modification examples. Further, FIG. 20 is a schematic diagram for explaining the fixing structure of the sole body to the upper body in the shoes according to the third and fourth modification examples. Hereinafter, with reference to FIGS. 19 and 20, the shoes 1A1 to 1A4 according to the first to fourth modification examples based on the above-described Embodiment 1 will be described. Note that the shoes 1A1 to 1A4 according to the first to fourth modification examples differ only in the configuration of the upper body 20 when compared with the shoe 1A according to the above-described Embodiment 1.

[0152] As shown in FIG. 19(A), in the shoe 1A1 according to the first modified example, only one belt-like portion 23 is provided on the upper body 20. The belt-like portion 23 is located substantially at the center in the front-rear direction X of the midfoot portion R2 and extends along the left-right direction Y. That is, the belt-like portion 23 extends in a direction orthogonal to the shoe center SC. This belt-like portion 23 is positioned so as to be within the above-described regions Q1 and Q2.

[0153] As shown in FIG. 19(B), in the shoe 1A2 according to the second modified example, only one belt-like portion 23 is provided on the upper body 20. The belt-like portion 23 is located substantially at the center in the front-rear direction X of the midfoot portion R2 and extends so as to intersect both the front-rear direction X and the left-right direction Y. That is, the belt-like portion 23 extends in a direction that intersects the shoe center SC non-orthogonally. A part of this belt-like portion 23 is positioned so as to be within the above-described regions Q1 and Q2.

[0154] As shown in FIG. 20(A), in the shoe 1A3 according to the third modified example, only one belt-like portion 23 is provided on the upper body 20. The belt-like portion 23 is positioned so as to straddle the rear end of the forefoot portion R1 and the front end of the midfoot portion R2 and extends along the left-right direction Y. That is, the belt-like portion 23 extends in a direction orthogonal to the shoe center SC. A part of this belt-like portion 23 is positioned so as to be within the above-described regions Q1 and Q2.

[0155] As shown in Fig. 20(B), in the shoe 1A4 according to the fourth modification, three belt-like portions 23 are provided on the upper body 20 at intervals in the front-rear direction X. One of the three belt-like portions 23 is located at a portion closer to the rear end in the front-rear direction X of the front foot portion R1, another one is located at substantially the center in the front-rear direction X of the middle foot portion R2, and the remaining one is located at a portion closer to the front end of the rear foot portion R3. All of these three belt-like portions 23 extend along the left-right direction Y (that is, the direction orthogonal to the shoe center SC). Among these three belt-like portions 23, the belt-like portion 23 located at substantially the center in the front-rear direction X of the middle foot portion R2 is positioned so as to be within the above-described regions Q1 and Q2.

[0156] Even when the configurations such as those of the first modification to the fourth modification are adopted, the sole body 30 can be stably fixed to the upper body 20, and it is possible to suppress the sole body 30 from being displaced inside the upper body 20 during use. Therefore, by configuring in this way, the same effects as those described in the above-described Embodiment 1 can be obtained, and the shoes 1A1 to 1A4 with significantly improved fit to the wearer's foot and stability at the time of landing can be obtained.

[0157] In addition, when the belt-like portion 23 described above is provided on the upper body 20, there is a concern that the bending of the shoe during running or walking may be slightly inhibited. However, as in the above-described Embodiment 1 and these First to Fourth Modification Examples, the belt-like portion 23 is arranged to extend in a direction intersecting the front-rear direction X, and further, the belt-like portion 23 is arranged only in a partial region in the front-rear direction X, whereby the inhibition of the bending of the shoe can be significantly suppressed. Further, as in the above-described Embodiment 1 and these First to Fourth Modification Examples, the belt-like portion 23 is not provided at a position corresponding to the MP joint of the wearer's foot, which is the portion where the shoe bends the most (that is, the boundary portion between the front foot portion R1 and the middle foot portion R2), or as in the above-described Embodiment 1 and Fourth Modification Example, the belt-like portion 23 is provided so as to be divided at intervals in the front-rear direction X, whereby the displacement of the sole body 30 can be effectively prevented with almost no inhibition of the bending of the shoe. Therefore, if the shoes 1A, 1A1 to 1A4 according to the above-described Embodiment 1 and the First to Fourth Modification Examples are used, a significant decrease in the followability of the shoe to the movement of the foot can be suppressed.

[0158] Further, as in the Second Modification Example, when the belt-like portion 23 is provided to extend in a direction intersecting the shoe center SC non-orthogonally, the sole body 30 can be held over a wider range in the front-rear direction X without increasing the width of the belt-like portion 23. Therefore, it becomes possible to more efficiently and stably fix the sole body 30 to the upper body 20.

[0159] In addition, in order to more stably fix the sole body 30 to the upper body 20, it is effective to increase the number of the belt-like portions 23. However, in order to prevent the assembly work from becoming complicated, it is preferable not to extremely increase the number of the belt-like portions 23. From such a viewpoint, the number of the belt-like portions 23 is preferably about 1 to 3. Further, when a plurality of belt-like portions 23 are provided, in order to more stably fix the sole body 30 to the upper body 20, it is preferable to arrange them without bias in the front-rear direction X.

[0160] (Fifth and Sixth Modification Examples) FIG. 21 is a cross-sectional view of a main part of an upper body of a shoe according to a fifth modified example, and FIG. 22 is a cross-sectional view of a main part of an upper body of a shoe according to a sixth modified example. Hereinafter, with reference to FIGS. 21 and 22, shoes 1A5 and 1A6 according to the fifth modified example and the sixth modified example based on the above-described first embodiment will be described. Note that the shoes 1A5 and 1A6 according to the fifth modified example and the sixth modified example are different only in the configuration of the upper body 20 when compared with the shoe 1A according to the above-described first embodiment.

[0161] In the shoe 1A according to the above-described first embodiment, one end 23a of the band portion 23 is attached to the inner foot side wall portion 22A, for example, by sewing or the like, and the other end 23b of the band portion 23 is attached to the outer foot side wall portion 22B, for example, by sewing or the like. That is, the band portion 23 is fixedly attached to the inner foot side wall portion 22A and the outer foot side wall portion 22B in a non-detachable manner. On the other hand, in the shoes 1A5 and 1A6 according to the fifth modified example and the sixth modified example, the band portion 23 is configured to be detachable from one of the inner foot side wall portion 22A and the outer foot side wall portion 22B.

[0162] As shown in FIG. 21, in the shoe 1A5 according to the fifth modified example, one end 23a of the band portion 23 is attached to the inner foot side wall portion 22A, for example, by sewing or the like, while the other end 23b of the band portion 23 is not fixed to the outer foot side wall portion 22B. Specifically, a male hook-and-loop fastener is provided on one of the other end 23b of the band portion 23 and the outer foot side wall portion 22B, and a female hook-and-loop fastener is provided on the other of the other end 23b of the band portion 23 and the outer foot side wall portion 22B.

[0163] Thereby, when the other end 23b of the band portion 23 is overlapped with the outer foot side wall portion 22B, the male hook-and-loop fastener and the female hook-and-loop fastener described above are engaged, so that the other end 23b of the band portion 23 is fixed to the outer foot side wall portion 22B. Therefore, by configuring in this way, the other end 23b of the band portion 23 can be configured to be detachable from the outer foot side wall portion 22B.

[0164] As shown in FIG. 22, in the shoe 1A6 according to the sixth modified example, while the other end 23b of the belt-like portion 23 is attached to the outer foot side wall portion 22B by, for example, sewing or the like, one end 23a of the belt-like portion 23 is not fixed to the inner foot side wall portion 22A. Specifically, a male hook-and-loop fastener is provided on one of the one end 23a of the belt-like portion 23 and the inner foot side wall portion 22A, and a female hook-and-loop fastener is provided on the other of the one end 23a of the belt-like portion 23 and the inner foot side wall portion 22A.

[0165] Thereby, when one end 23a of the belt-like portion 23 is overlapped with the inner foot side wall portion 22A, the male hook-and-loop fastener and the female hook-and-loop fastener described above are engaged, so that one end 23a of the belt-like portion 23 is fixed to the inner foot side wall portion 22A. Therefore, by configuring in this way, one end 23a of the belt-like portion 23 can be configured to be detachable from the inner foot side wall portion 22A.

[0166] Here, the sole body 30 may be attached to one end 23a or the other end 23b of the belt-like portion 23 described above in a state where it is previously housed inside the upper body 20 (that is, in a state where it is disposed on the lower wall portion 21 of the upper body 20), or after the attachment of one end 23a or the other end 23b of the belt-like portion 23 described above, the sole body 30 may be inserted into the upper body 20 so that the sole body 30 is sandwiched between the belt-like portion 23 and the lower wall portion 21.

[0167] When the configurations such as those of the fifth modified example to the sixth modified example are adopted, the sole body 30 can be stably fixed to the upper body 20, and not only can it be suppressed that the sole body 30 is displaced inside the upper body 20 during use, but also the fixing operation of the sole body 30 to the upper body 20 is facilitated. Therefore, by configuring in this way, not only the manufacturing is facilitated, but also the replacement operation of the sole body 30 becomes easy.

[0168] Note that, in the above description, the case where the strip portion 23 is configured to be detachable from one of the inner foot side wall portion 22A and the outer foot side wall portion 22B has been exemplified. However, the strip portion 23 may be configured to be detachable from both the inner foot side wall portion 22A and the outer foot side wall portion 22B. Further, as a method of configuring the strip portion 23 to be detachable from the inner foot side wall portion 22A and / or the outer foot side wall portion 22B, in addition to the use of the hook-and-loop fastener described above, various methods can be applied, such as using a so-called block type belt provided with an engaging portion having a snap-fit structure as the strip portion.

[0169] (Seventh Modification Example) FIG. 23 is a schematic diagram showing the relationship between the sole body and the strip portion of the shoe according to the seventh modification example, and FIG. 24 is a cross-sectional view of the shoe according to the seventh modification example. Hereinafter, with reference to FIGS. 23 and 24, the shoe 1A7 according to the seventh modification example based on the above-described Embodiment 1 will be described. Here, in FIG. 23, only the strip portion 23 of the upper body 20 is shown for easy understanding. Note that the shoe 1A7 according to the seventh modification example is different only in the configuration of the sole body 30 when compared with the shoe 1A according to the above-described Embodiment 1.

[0170] As shown in FIGS. 23 and 24, in the shoe 1A7 according to the seventh modification example, a groove portion 31c is provided in a portion of the top surface 31a of the midsole 31 that constitutes the upper surface of the sole body 30 and faces the strip portion 23. This groove portion 31c extends along the left-right direction Y, and both ends thereof reach the end surface of the midsole 31.

[0171] When configured in this way, it becomes possible to fit the holding portion 23c of the strip portion 23 into the groove portion 31c provided in the midsole 31. Therefore, it becomes possible to smoothly connect the top surface 31a of the midsole 31 and the upper surface of the holding portion 23c of the strip portion 23, so that it is possible to suppress the wearer from feeling a sense of discomfort on the sole when wearing the shoe.

[0172] Therefore, when configured in this way, the sole body 30 can be stably fixed to the upper body 20. Not only can it be suppressed that the sole body 30 is displaced inside the upper body 20 during use, but also the shoe 1A7 can have a comfortable wearing feeling.

[0173] (Embodiment 2) FIG. 25 is a perspective view of the upper body of the shoe according to Embodiment 2, and FIG. 26 is a schematic cross-sectional view taken along line XXVI-XXVI shown in FIG. 25. Next, the shoe 1B according to the present embodiment will be described with reference to FIGS. 25 and 26. Note that the shoe 1B according to the present embodiment is different only in the configuration of the upper body 20 when compared with the shoe 1A according to Embodiment 1 described above.

[0174] In the shoe 1A according to Embodiment 1 described above, the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 are a upper side portion (that is, a portion disposed in the upper side space SP2 among the inner foot side wall portion 22A and the outer foot side wall portion 22B) that is a portion facing the insertion space SP3, and a lower side portion (that is, a portion disposed in the lower side space SP1 among the inner foot side wall portion 22A and the outer foot side wall portion 22B) that is a portion facing the peripheral surface of the sole body 30, and are configured by a single member.

[0175] Here, the upper side portion among the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 is a portion that contacts the peripheral surface of the wearer's foot, and from the viewpoint of improving the foot strike, it is preferably configured by a more flexible member, and from the viewpoint of improving the fit, it is preferably configured by a member having heat shrinkability as described above. On the other hand, the lower side portion among the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 is a portion to which the belt-like portion 23 is attached, and from the viewpoint of more stably fixing the sole body 30, it is preferably configured by a member having less stretchability and no heat shrinkability.

[0176] Therefore, in the shoe 1A according to the above-described Embodiment 1, since the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 are formed of a single member, the corresponding portion of the upper body 20 is formed of either a member suitable for the upper side portion or a member suitable for the lower side portion, and there is a concern that it is not always possible to achieve both an improvement in foot strike and fit and a stable fixing of the sole body 30.

[0177] In this regard, the shoe 1B according to the present embodiment solves the above problems by configuring the upper side portion and the lower side portion with members of different materials. That is, as shown in FIGS. 25 and 26, in the shoe 1B according to the present embodiment, the upper side portion, which is the portion of the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20 facing the insertion space SP3, and the lower side portion, which is the portion of the upper body 20 of the inner foot side wall portion 22A and the outer foot side wall portion 22B facing the peripheral surface of the sole body 30, are formed of members of different materials. In FIG. 25, for ease of understanding, only the member constituting the lower side portion is shown in a dark color.

[0178] More specifically, in the shoe 1B according to the present embodiment, among the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20, the upper side portion, which is the portion facing the insertion space SP3 (that is, the portion disposed in the upper side space SP2 of the inner foot side wall portion 22A and the outer foot side wall portion 22B), is formed of a flexible member or, in addition thereto, a heat-shrinkable member, and among the inner foot side wall portion 22A and the outer foot side wall portion 22B of the upper body 20, the lower side portion, which is the portion facing the peripheral surface of the sole body 30 (that is, the portion disposed in the lower side space SP1 of the inner foot side wall portion 22A and the outer foot side wall portion 22B), is formed of a different material 22d that is less stretchable than the upper side portion or, in addition thereto, a non-heat-shrinkable member. This different material 22d is joined to the upper side portion and the lower wall portion 21, for example, by stitching.

[0179] When configured in this way, not only can the same effects as those described in the above-described Embodiment 1 be obtained, but further, it is possible to provide a shoe 1B in which both an improvement in foot contact and fit and a stable fixing of the sole body 30 are achieved.

[0180] (Summary of the Disclosure in the Embodiments and Modification Examples) Summarizing the characteristic configurations disclosed in the above-described embodiments and modification examples, they are as follows.

[0181] [Appendix 1] A shoe having an insertion space into which the foot of the wearer is inserted, a flexible shell including a bottom wall portion having a ground contact surface and a peripheral wall portion erected from the periphery of the bottom wall portion, a bag-shaped upper body that is housed in the shell and provided with an opening into which the foot of the wearer can be inserted, a sole body that is housed in the upper body and is located above the bottom wall portion and is configured to support the sole of the foot of the wearer, the peripheral wall portion has an inner foot side peripheral wall portion configured to cover the inner foot side portion of the foot of the wearer and an outer foot side peripheral wall portion configured to cover the outer foot side portion of the foot of the wearer, the upper body, a lower wall portion extending along the bottom wall portion, an inner foot side wall portion extending along the inner foot side peripheral wall portion, an outer foot side wall portion extending along the outer foot side peripheral wall portion, and a belt-like portion having one end connected to the inner foot side wall portion and the other end connected to the outer foot side wall portion, a shoe in which the sole body is sandwiched between the lower wall portion and the belt-like portion, and the sole body is fixed to the upper body.

[0182] By adopting the configuration described in the above-mentioned Supplementary Note 1, the sole body can be sandwiched and fixed by the lower wall portion of the upper body and the belt-like portion provided on the upper body. Therefore, it is possible to stably fix the sole body to the upper body without using an adhesive or while reducing the amount of adhesive used.

[0183] [Supplementary Note 2] When a virtual plane passing through the position of 45% of the total length of the insertion space on the shoe center of the insertion space from the front-end position on the shoe center of the insertion space and perpendicular to the shoe center is defined as the first virtual plane, and a virtual plane passing through the position of 80% of the total length of the insertion space on the shoe center of the insertion space from the front-end position on the shoe center of the insertion space and perpendicular to the shoe center is defined as the second virtual plane, at least a part of the belt-like portion is arranged so as to be located within the region from the first virtual plane to the second virtual plane. The shoe according to Supplementary Note 1.

[0184] By adopting the configuration described in the above-mentioned Supplementary Note 2, a belt-like portion is provided at a portion where the sole body is likely to be displaced during walking or running. Therefore, it is possible to more stably fix the sole body to the upper body.

[0185] [Supplementary Note 3] The shoe according to Supplementary Note 1 or 2, wherein the belt-like portion extends in a direction perpendicular to the shoe center.

[0186] By adopting the configuration described in the above-mentioned Supplementary Note 3, the sole body can be stably held by the belt-like portion. Therefore, it is possible to more stably fix the sole body to the upper body.

[0187] [Supplementary Note 4] The shoe according to Supplementary Note 1 or 2, wherein the belt-like portion extends in a direction intersecting non-perpendicularly with the shoe center.

[0188] By adopting the configuration described in the above-mentioned supplementary note 4, the sole body can be held over a wider range in the front-rear direction without expanding the width of the belt-like portion, so that the sole body can be more efficiently and stably fixed to the upper body.

[0189] [Supplementary Note 5] The shoe according to any one of supplementary notes 1 to 4, wherein the belt-like portion is detachably configured with respect to at least one of the inner foot side wall portion and the outer foot side wall portion.

[0190] By adopting the configuration described in the above-mentioned supplementary note 5, the fixing operation of the sole body to the upper body is facilitated, and the replacement operation of the sole body is also made easier.

[0191] [Supplementary Note 6] The shoe according to supplementary note 5, wherein the belt-like portion is fixedly non-detachably attached to the inner foot side wall portion and is detachably configured with respect to the outer foot side wall portion.

[0192] By adopting the configuration described in the above-mentioned supplementary note 6, the fixing operation of the sole body to the upper body is facilitated, and the replacement operation of the sole body is also made easier.

[0193] [Supplementary Note 7] The shoe according to any one of supplementary notes 1 to 6, wherein a plurality of the belt-like portions are arranged at intervals in the front-rear direction, which is the direction matching the foot length direction of the wearer's foot.

[0194] By adopting the configuration described in the above-mentioned supplementary note 7, the sole body can be more stably fixed over a wide range in the front-rear direction, and by adjusting the arrangement positions of these plurality of belt-like portions, it is possible to effectively prevent the displacement of the sole body with almost no inhibition of the flexion of the shoe.

[0195] [Supplementary Note 8] The shoe according to any one of Appendices 1 to 7, wherein the belt-like part is made of a non-elastic member or a member having lower elasticity than the inner foot side wall part and the outer foot side wall part.

[0196] By adopting the configuration described in the above Appendix 8, it becomes difficult for the belt-like part to slack, so that the sole body can be stably held, and thus the sole body can be more stably fixed to the upper body.

[0197] [Appendix 9] A groove portion is provided in a portion of the sole body facing the belt-like part, The shoe according to any one of Appendices 1 to 8, wherein the belt-like part is fitted into the groove portion.

[0198] By adopting the configuration described in the above Appendix 9, not only can the displacement of the sole body be more reliably suppressed by fitting the belt-like part into the groove portion, but also the upper surface of the sole body and the upper surface of the belt-like part are smoothly continuous, so that the wearer can be prevented from feeling a sense of discomfort on the sole when wearing, and a comfortable wearing feeling can be realized.

[0199] [Appendix 10] The shoe according to any one of Appendices 1 to 9, wherein the inner foot side wall part and the outer foot side wall part are formed of a single member so as to include an upper side part which is a part facing the insertion space and a lower side part which is a part facing the peripheral surface of the sole body.

[0200] By adopting the configuration described in the above Appendix 10, an upper body with a simpler configuration can be obtained, and the manufacturing cost can be reduced.

[0201] [Appendix 11] The upper side part which is a part of the inner foot side wall part and the outer foot side wall part facing the insertion space and the lower side part which is a part of the inner foot side wall part and the outer foot side wall part facing the peripheral surface of the sole body are formed of members made of different materials, The shoe according to any one of Appendices 1 to 9, wherein the lower side portion has less stretchability than the upper side portion.

[0202] By adopting the configuration described in Appendix 11, it becomes possible to more stably fix the sole body to the upper body while realizing good foot contact with respect to the wearer's foot.

[0203] [Appendix 12] The shoe according to any one of Appendices 1 to 11, wherein the sole body contains a cushioning material.

[0204] By adopting the configuration described in Appendix 12, it becomes possible to stably fix the sole body to the upper body while ensuring the cushioning performance at the time of landing.

[0205] [Appendix 13] The shoe according to Appendix 12, wherein the sole body further contains a plate harder than the shell.

[0206] By adopting the configuration described in Appendix 13, it becomes possible to stably fix the sole body to the upper body while ensuring the repulsion performance at the time of kicking off.

[0207] [Appendix 14] On the inner peripheral surface of the peripheral wall portion, a pressing surface is provided that protrudes toward the inside of the shell and faces the bottom wall portion side. The shoe according to any one of Appendices 1 to 13, wherein the sole body is fixed to the shell by being sandwiched between the pressing surface and the bottom wall portion with the upper body intervening between the peripheral edge portion of the sole body and the portion of the upper body facing the peripheral edge portion.

[0208] By adopting the configuration described in Appendix 14, it becomes possible to sandwich and fix the sole body by the bottom wall portion of the shell and the pressing surface provided on the peripheral wall portion of the shell, so that it becomes possible to stably fix the sole body not only to the upper body but also to the shell.

[0209] (Other forms, etc.) In the above-described embodiments and modified examples, the configuration of the sole body shown is merely illustrative, and various modifications are possible. That is, the sole body does not necessarily have to include both the cushioning material and the rebounding material, and it may be configured by only one of these, or may further include other members.

[0210] Also, in the above-described embodiments and modified examples, the case where a pressing surface is provided on the peripheral wall portion of the flexible shell by providing a constricted portion on the peripheral wall portion was exemplified. However, it is not necessarily required to provide a pressing surface on the peripheral wall portion, and even when providing a pressing surface, it is arbitrary how to form the peripheral wall portion of the flexible shell to provide the pressing surface.

[0211] Also, in the above-described embodiments and modified examples, the case where one end and the other end of the belt-like portion are bent downward in the vertical direction (i.e., the grounding surface side) and attached to the inner foot side wall portion and the outer foot side wall portion was exemplified. However, one end and the other end of these belt-like portions may be bent upward in the vertical direction (i.e., the opening side) and attached to the inner foot side wall portion and the outer foot side wall portion.

[0212] Also, in the above-described embodiments and their modified examples, the description was made on the premise that the shoes are used without wearing the insole. Naturally, these shoes may be used with the insole attached. In that case, the above-described belt-like portion and sole body will be covered by the insole. When the shoes are provided with an insole in this way, shoes with better foot feel can be obtained.

[0213] Also, the characteristic configurations shown in the above-described embodiments and modified examples can be combined with each other as long as they do not deviate from the gist of the present disclosure.

[0214] Thus, the above-described embodiments and their modifications disclosed this time are illustrative in all respects and not restrictive. The technical scope of the present invention is defined by the scope of the claims, and includes all modifications within the meaning and scope equivalent to the description of the claims.

Explanation of Reference Numerals

[0215] 1A, 1A1 to 1A7, 1B shoes, 2 opening, 3 ground contact surface, 10, 10A shells, 10a mouth part, 10b mesh structure part, 10c hole part, 11 bottom wall part, 11a inner surface, 11b outer surface, 12 peripheral wall part, 12A inner foot side peripheral wall part, 12B outer foot side peripheral wall part, 12C rear side peripheral wall part, 12D front side peripheral wall part, 12a inner peripheral surface, 12b outer peripheral surface, 13A constricted part, 14 pressing surface, 14A inner foot side pressing surface, 14B outer foot side pressing surface, 14C rear side pressing surface, 20 upper body, 20a opening, 21 lower wall part, 21a inner surface, 21b outer surface, 22 side wall part, 22A inner foot side wall part, 22B outer foot side wall part, 22C rear side wall part, 22D front side wall part, 22a inner peripheral surface, 22b outer peripheral surface, 22d different material, 23 belt-like part, 23a one end, 23b the other end, 23c holding part, 24 fastening part, 30 sole body, 31 midsole, 31a top surface, 31b bottom surface, 31c groove part, 32 plate, 32a first main surface, 32b second main surface, 32c peripheral end surface, 40 additional sole body, 50 heel counter, 51 surrounding part, 51A first part, 51B second part, 51C third part, 52 protruding part, P1 first boundary surface, P2 second boundary surface, PF front side end position, PR rear side end position, R1 forefoot part, R2 midfoot part, R3 rearfoot part, SC shoe center, SP1 lower side space, SP2 upper side space, SP3 insertion space, VP1 first virtual surface, VP2 second virtual surface, VP3 third virtual surface.

Claims

1. A shoe having an insertion space inside into which the foot of the wearer is inserted, comprising: a flexible shell including a bottom wall portion having a ground contact surface and a peripheral wall portion erected from the periphery of the bottom wall portion; a bag-shaped upper body accommodated in the shell and provided with an opening into which the foot of the wearer can be inserted; a sole body that is accommodated in the upper body and is positioned above the bottom wall portion and is configured to support the sole of the foot of the wearer; the peripheral wall portion has an inner-foot-side peripheral wall portion configured to cover the inner-foot-side portion of the foot of the wearer and an outer-foot-side peripheral wall portion configured to cover the outer-foot-side portion of the foot of the wearer; the upper body includes: a lower wall portion extending along the bottom wall portion; an inner-foot-side wall portion extending along the inner-foot-side peripheral wall portion; an outer-foot-side wall portion extending along the outer-foot-side peripheral wall portion; a belt-shaped portion having one end connected to the inner-foot-side wall portion and the other end connected to the outer-foot-side wall portion; The shoe, wherein the sole body is sandwiched between the lower wall portion and the belt-shaped portion, and the sole body is fixed to the upper body.

2. When a virtual plane passing through a position that is 45% of the total length of the insertion space on the shoe center of the insertion space from the front-end position on the shoe center of the insertion space and orthogonal to the shoe center is defined as the first virtual plane, and a virtual plane passing through a position that is 80% of the total length of the insertion space on the shoe center of the insertion space from the front-end position on the shoe center of the insertion space and orthogonal to the shoe center is defined as the second virtual plane, at least a part of the belt-shaped portion is arranged so as to be located within the region from the first virtual plane to the second virtual plane. The shoe according to Claim 1.

3. The shoe according to Claim 1, wherein the belt-shaped portion extends in a direction orthogonal to the shoe center.

4. The shoe according to Claim 1, wherein the belt-shaped portion extends in a direction intersecting non-orthogonally with the shoe center.

5. The shoe according to Claim 1, wherein the belt-shaped portion is configured to be detachable from at least one of the inner-foot-side wall portion and the outer-foot-side wall portion.

6. The shoe according to Claim 5, wherein the belt-shaped portion is fixedly attached to the inner-foot-side wall portion in a non-detachable manner and is configured to be detachable from the outer-foot-side wall portion.

7. The shoe according to claim 1, wherein a plurality of the strip-shaped portions are arranged at intervals in the front-rear direction which is a direction matching the longitudinal direction of the wearer's foot.

8. The shoe according to claim 1, wherein the strip-shaped portion is formed of a non-elastic member or a member having lower elasticity than the inner foot side wall portion and the outer foot side wall portion.

9. A groove portion is provided in a portion of the sole body facing the strip-shaped portion. The shoe according to claim 1, wherein the strip-shaped portion is fitted into the groove portion.

10. The shoe according to claim 1, wherein the inner foot side wall portion and the outer foot side wall portion are formed of a single member so as to include an upper side portion which is a portion facing the insertion space and a lower side portion which is a portion facing the peripheral surface of the sole body.

11. An upper side portion which is a portion of the inner foot side wall portion and the outer foot side wall portion facing the insertion space and a lower side portion which is a portion of the inner foot side wall portion and the outer foot side wall portion facing the peripheral surface of the sole body are formed of members of different materials. The shoe according to claim 1, wherein the lower side portion has less elasticity than the upper side portion.

12. The shoe according to claim 1, wherein the sole body includes a cushioning material.

13. The shoe according to claim 12, wherein the sole body further includes a plate harder than the shell.

14. On the inner peripheral surface of the peripheral wall portion, a pressing surface is provided which protrudes toward the inside of the shell and faces the bottom wall portion side. The shoe according to claim 1, wherein the sole body is fixed to the shell by being sandwiched between the pressing surface and the bottom wall portion with the peripheral edge portion of the sole body and the upper body intervening between the portion facing the peripheral edge portion.

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