Shoes and manufacturing method thereof

Abstract

To improve fittability and a support property to a metatarsal region of a wearer's foot.SOLUTION: An upper structure 2 of a shoe 1 includes an inner upper part 20 with elasticity, having a front foot area F for covering a forefoot region of a wearer's foot and a middle foot area M for covering a metatarsal region, and an outer upper part 21 being disposed outside the inner upper part 20, overlapped with the inner upper part 20, and having elasticity smaller than that of the inner upper part 20. In a state where the upper structure 2 is turned upside down and the inner upper part 20 is in a state of being stretched and having a free length without any slack by dead weight, the inner upper part 20 has a gap e between itself and the outer upper part 21 at least in the middle foot area M.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a shoe upper structure that can improve fit and support not only for the forefoot but also for the midfoot of a wearer, and to a shoe having the upper structure and a method for manufacturing the shoe. [Background technology]

[0002] U.S. Patent No. 4,438,574 describes a sports shoe (10) having an upper structure consisting of a stretchable inner layer (40) and a non-stretchable outer layer (42) in the front region (column 4, lines 32-39 and FIGS. 1-4). Here, the front region refers to the toe region of the foot (column 3, lines 60-63).

[0003] The above U.S. patent specification states that the slight stretching of the elastic inner layer (40) allows the inner layer (40) to conform to the shape of the front region of the foot to obtain an appropriate fit (column 3, lines 11-13), while the non-elastic outer layer (42) prevents the inner layer (40) from losing its shape and thereby losing the appropriate fit (i.e., support) in the front region of the foot (same column, lines 17-21). Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above upper structure is designed with a focus only on fit and support in the front region of the foot (i.e., the toe region), with the inner layer (40) being arranged to evenly compress the entire front region of the foot and the outer layer (42) being arranged to completely overlap the inner layer (40).

[0005] In addition, in the above-mentioned upper structure, as shown in FIG. 4 of the above-mentioned U.S. patent specification, a large step is generated at the boundary between the front region consisting of the inner layer (40) and the outer layer (42) and the rear region consisting of the woven fabric layers (28, 30) on the rear side (right side in the figure) of the front region. Such a step prevents smooth bending of the foot when bending, inhibits adhesion and fit to the foot, and creates an uncomfortable feeling in the highly sensitive forefoot.

[0006] On the other hand, since the individual difference in foot circumference is larger in the midfoot than in the forefoot, the midfoot is more important than the forefoot in fitting the upper according to individual variations such as flat feet, high arch, low arch, etc. Also, sports shoes, especially indoor sports shoes involving intense lateral movements, require higher support in the midfoot than in the forefoot.

[0007] The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a shoe upper structure capable of improving fit and support for the midfoot of a wearer. The present invention also aims to provide a shoe having such an upper structure and a method for manufacturing the shoe. [Means for solving the problem]

[0008] Shoes according to the present invention The shoe includes an upper structure and a midsole. The upper structure is The upper structure The shoe has a forefoot region that is disposed on the inside and covers the forefoot of the wearer's foot and a midfoot region that covers the midfoot of the wearer's foot; 、 An inner upper part having elasticity; The upper structure has a lower elasticity than the inner upper portion. It is located on the outside and overlaps the inner upper part. The lower ends of the inner and outer instep sides are fixed to the midsole. Outer upper part and There are. When the upper structure is turned upside down and the inner upper portion is stretched tightly under its own weight at its free length, there is a gap between the inner upper portion and the outer upper portion at least in the midfoot region. In the midfoot region, the lower ends of the inner upper part on the medial and lateral instep sides are connected to the outer upper part and are fixed to the midsole via the outer upper part.

[0009] According to the present invention, when the shoe is worn, the inner upper part having elasticity stretches within the space, which causes the inner upper part to apply a pressing force to the midfoot part of the foot, thereby improving the fit to the midfoot part. Moreover, the stretching of the inner upper part within the space is restricted by the outer upper part having low elasticity, so that the outer upper part can improve the support for the midfoot part.

[0010] In this case, a gap is formed between the inner upper part and the outer upper part, at least in the midfoot region, allowing the inner upper part to stretch smoothly in the midfoot region, thereby improving fit and support for the midfoot without causing discomfort to the foot.

[0011] Shoes according to the present invention The shoe includes an upper structure and a midsole. The upper structure is The upper structure The shoe has a forefoot region that is disposed on the inside and covers the forefoot of the wearer's foot and a midfoot region that covers the midfoot of the wearer's foot; 、 An inner upper part having elasticity; The upper structure has a lower elasticity than the inner upper portion. It is located on the outside and overlaps the inner upper part. The lower ends of the inner and outer instep sides are fixed to the midsole. Equipped with an outer upper part There are. When the inner upper part and the outer upper part are laid out on a plane, the dimension of the inner upper part in the foot width direction is smaller than the dimension of the outer upper part in the foot width direction at least in the midfoot region. In the midfoot region, the lower ends of the inner upper part on the medial and lateral instep sides are connected to the outer upper part and are fixed to the midsole via the outer upper part.

[0012] According to the present invention, since the dimension of the inner upper part in the foot width direction in the midfoot region is smaller than the dimension of the outer upper part in the foot width direction, the relatively highly elastic inner upper part stretches when the shoe is worn, and the inner upper part exerts a pressing force on the midfoot part of the foot, resulting in an improved fit to the midfoot part. Moreover, since the stretch of the inner upper part is restricted by the outer upper part with low elasticity, the outer upper part can improve the support for the midfoot part.

[0013] In this case, at least in the midfoot region, the dimension of the inner upper part in the foot width direction is smaller than the dimension of the outer upper part in the foot width direction, allowing the inner upper part to stretch smoothly in the midfoot region, thereby improving fit and support for the midfoot without causing any discomfort to the foot.

[0014] Shoes according to the present invention The shoe includes an upper structure and a midsole. The upper structure is The upper structure The shoe has a forefoot region that is disposed on the inside and covers the forefoot of the wearer's foot and a midfoot region that covers the midfoot of the wearer's foot; 、 An inner upper part having elasticity; The upper structure has a lower elasticity than the inner upper portion. It is located on the outside and overlaps the inner upper part. The lower ends of the inner and outer instep sides are fixed to the midsole. Outer upper part and There are. With the inner upper part and the outer upper part laid out on a plane and the last laid out on a plane, at least in the midfoot region, the foot width direction dimension of the inner upper part corresponding to the foot width direction dimension of the last is smaller than the foot width direction dimension of the last. In the midfoot region, the lower ends of the inner upper part on the medial and lateral instep sides are connected to the outer upper part and are fixed to the midsole via the outer upper part.

[0015] According to the present invention, since the dimension of the inner upper part in the foot width direction is smaller than the dimension of the last in the foot width direction at least in the midfoot region, the relatively highly elastic inner upper part stretches when the shoe is worn, and the inner upper part exerts a pressing force on the midfoot region of the foot, resulting in improved fit in the midfoot region. Moreover, since the stretch of the inner upper part is restricted by the outer upper part with low elasticity, the outer upper part can improve support for the midfoot region.

[0016] In this case, since the dimension of the inner upper part in the foot width direction is smaller than the dimension of the last in the foot width direction, the inner upper part can be stretched smoothly and reliably at least in the midfoot region, thereby improving the fit and support for the midfoot without causing any discomfort to the foot.

[0017] In the present invention, a throat portion is formed in the upper region of the instep of the outer upper portion, communicating with the opening of the foot and extending in the front-rear direction, and when the open edge of the throat portion of the outer upper portion is abutted against the outer surface of the inner upper portion in an upside-down state, a gap is formed at least either between the outer instep side region of the outer upper portion and the outer instep side region of the inner upper portion on the outer instep side of the throat portion, or between the inner instep side region of the outer upper portion and the inner instep side region of the inner upper portion on the inner instep side of the throat portion. 。

[0018] In this case, when the shoe is worn, the outer instep side region or (and) inner instep side region of the inner upper part on the side where the gap is formed stretches within the gap, whereby the outer instep side region or (and) inner instep side region of the inner upper part applies a pressing force to the forefoot and midfoot parts of the foot, resulting in improved fit to the forefoot and midfoot parts. Moreover, in this case, the stretching of the outer instep side region or (and) inner instep side region of the inner upper part within the gap is restricted by the outer upper part with low elasticity, so that the outer upper part can improve support for the forefoot and midfoot parts.

[0019] In the present invention, a throat portion is formed in the upper region of the instep of the outer upper portion, which is open and communicates with the opening of the foot and extends in the front-to-rear direction, and when a cross-section of the forefoot region and midfoot region of the upper structure is taken with the opening edge of the throat portion of the outer upper portion abutting the outer surface of the inner upper portion in an upside-down position, in at least one of the medial instep region or lateral instep region across the throat portion, the circumferential length from the lower end of the inner surface of the outer upper portion to the opening edge of the throat portion is longer than the circumferential length from the lower end of the outer surface of the inner upper portion to the position where it abuts against the opening edge of the throat portion.

[0020] In this case, when the shoe is worn, the outer instep side region or (and) inner instep side region of the inner upper part, which has a short circumference, stretches within the gap, whereby the outer instep side region or (and) inner instep side region of the inner upper part applies a pressing force to the forefoot and midfoot parts of the foot, thereby improving the fit to the forefoot and midfoot parts. Moreover, in this case, the stretching of the outer instep side region or (and) inner instep side region of the inner upper part within the gap is restricted by the outer upper part, which has low elasticity, so that the outer upper part can improve the support for the midfoot part.

[0021] In the present invention, a throat portion is formed in the upper region of the instep of the outer upper part, which opens and extends in the front-to-rear direction and is connected to the opening of the foot, and a fastening member is provided in the throat portion for fastening the foot. The inner upper part extends circumferentially in the forefoot and midfoot regions from the medial instep region through the upper instep region to the lateral instep region, and when the outer upper part is fastened by the fastening member and the opening edge of the throat portion of the outer upper part abuts the outer surface of the inner upper part, the inner upper part is capable of stretching inside the outer upper part.

[0022] In this case, when the shoe is worn, the inner upper part stretches inside the outer upper part, so that the medial instep region, upper instep region, and lateral instep region of the inner upper part apply pressure to the forefoot and midfoot parts of the foot, thereby further improving the fit to the forefoot and midfoot parts. Moreover, in this case, the stretching of the inner upper part is restricted by the outer upper part, which has low elasticity, so that the outer upper part can improve the support for the forefoot and midfoot parts.

[0023] In the present invention, the elasticity of the inner upper part is greater in the midfoot region than in the forefoot region, so that the inner upper part is more stretchable in the midfoot region than in the forefoot region, thereby further improving the fit of the inner upper part to the three-dimensional shape of the midfoot of the foot.

[0024] In the present invention, the inner upper part has a substantially flat surface in the region from the forefoot region to the midfoot region. Here, the term "substantially flat surface" refers to a flat surface or a surface that can be considered flat without steps or unevenness due to overlapping of materials or changes in thickness, etc. Even if two or more materials or materials are connected by sewing, for example, a surface that is sewn by a so-called flat stitch, such as a butt stitch, is included in the substantially flat surface.

[0025] In this case, since the inner upper portion is constructed with a substantially flat surface, it is possible to eliminate the feeling of unevenness, discomfort, or pressure on the foot, and to prevent the smooth bending of the foot from being hindered, thereby further improving the adhesion and fit to the foot.

[0026] In the present invention, the inner upper part has a main body part and a stretchable part having stretchability, and no step is formed at the boundary between the main body part and the stretchable part. In this case, the absence of a step in the inner upper part eliminates the feeling of a step, discomfort, or pressure on the foot, and prevents the smooth bending of the foot from being hindered, thereby further improving the adhesion and fit to the foot.

[0027] In the present invention, the inner upper part has a main body part and a stretchable part having elasticity, and the main body part is formed by connecting a plurality of parts divided in the foot width direction or foot length direction. In this case, the divided surfaces of each part are formed into a convex or concave shape and connected to each other, so that the main body part can be made three-dimensional, and therefore the main body part can be made to conform to the three-dimensional shape of the foot, and since the inner upper part is already three-dimensionally shaped by the main body part before putting on the shoes, it becomes easier for the wearer to insert the foot into the opening of the upper, making it easier to put on the shoes.

[0028] The present invention In the present invention, the inner upper part has no bottom part in the midfoot region. Also, in the present invention, the inner upper part has stretchable parts in the lower parts on the medial and lateral instep sides.

[0029] The present invention relates to an upper Structure and Midsole A method for manufacturing a shoe having an upper structure teeth, The upper structure Located inside 、 an inner upper part having a forefoot region covering a forefoot portion of a wearer's foot and a midfoot region covering a midfoot portion, and having elasticity; The upper structure Located on the outside 、 The trousers are provided with an outer upper portion which overlaps the inner upper portion and has lower stretchability than the inner upper portion. The manufacturing method includes the following steps. i) providing an inner upper portion and an outer upper portion; ii) Inner upper part The lower ends of the inner and outer shells By sewing to the outer upper part, the upper structure The process of assembling. iii) Upper structure By covering the last, the inner upper part is stretched, and in that state The lower ends of the inner and outer instep parts of the outer upper are attached to the midsole. Stick As a result, in the midfoot region, the lower ends of the inner upper part on the inner and outer instep sides are fixed to the midsole via the outer upper part. Process. iv) Upper structure a process of removing the inner upper portion from the last, thereby contracting the inner upper portion from the stretched state to its pre-stretched state and forming a gap between the inner upper portion and the outer upper portion.

[0030] According to the present invention, the stretch state of the inner upper part when worn can be confirmed during the manufacturing process. Also, when the manufactured shoe is worn, the stretchable inner upper part stretches, which causes the inner upper part to apply a pressing force to the forefoot and midfoot parts of the foot, thereby improving the fit of the forefoot and midfoot parts. Moreover, the stretch of the inner upper part is restricted by the outer upper part with low stretchability, so that the outer upper part can improve the support for the midfoot part.

[0031] In the present invention, the inner upper part and the outer upper part are laid out on a plane, and the last is laid out on a plane, At least midfoot In the area, Corresponds to the last's width dimension The dimension of the inner upper part in the foot width direction is smaller than the dimension of the last in the foot width direction.

[0032] In this case, At least midfoot In the region, the dimension of the inner upper part in the foot width direction is smaller than the dimension of the last in the foot width direction, so that the inner upper part At least midfoot This allows for smooth and reliable stretching in the area, without causing discomfort to the foot. , medium This improves fit and support for the foot. Effect of the Invention

[0033] As described above, according to the present invention, in the midfoot region, the inner upper part has a gap between it and the outer upper part, or when the inner upper part and the outer upper part are laid out on a plane, the dimension of the inner upper part in the foot width direction is smaller than the dimension of the outer upper part in the foot width direction, or when the inner upper part and the outer upper part are laid out on a plane and the last is laid out on a plane, the dimension of the inner upper part in the foot width direction corresponding to the dimension of the last in the foot width direction is smaller than the dimension of the last in the foot width direction, so that when the shoe is worn, the elastic inner upper part stretches, whereby the inner upper part applies a pressing force to the midfoot part of the foot, resulting in an improved fit to the midfoot part. Growth Since the length is restricted by the outer upper part having low elasticity, the outer upper part can improve support for the midfoot. [Brief description of the drawings]

[0034] [Figure 1] 1 is a side view of the medial side of a sports shoe (for a right foot) equipped with an upper structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the outer instep side of the sports shoe (FIG. 1). [Diagram 3] FIG. 1 is a plan view of the sports shoe; [Figure 4] FIG. 2 is a diagram showing an inner upper part and an outer upper part that constitute the upper structure (FIG. 1) of the sports shoe (FIG. 1) with the shoelaces removed. [Diagram 5] 2 is a diagram showing an inner upper part and an outer upper part constituting the upper structure (FIG. 1) of the sports shoe (FIG. 2) with the shoelaces removed. FIG. [Figure 6]3 is a diagram showing an inner upper part and an outer upper part constituting the upper structure (FIG. 1) of the sports shoe (FIG. 3) with the shoelaces removed. FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 8A] FIG. 8 is a cross-sectional view taken along line VIIIA-VIIIA in FIG. [Figure 9] FIG. 7 is a cross-sectional view taken along line IX-IX in FIG. [Figure 9A] IXA-IXA line cross-sectional view of FIG. 3. [Figure 10] FIG. 5 is a diagram illustrating the upper structure of FIG. 4. [Figure 11] FIG. 6 is a diagram illustrating the upper structure of FIG. 5. [Figure 12] FIG. 11 is a diagram showing the upper structure of FIG. 10 together with a skeletal diagram of a foot. [Figure 13] FIG. 12 is a diagram showing the upper structure of FIG. 11 together with a skeletal diagram of a foot. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 10. [Figure 15] FIG. 2 is a development view of an inner upper part and an outer upper part constituting the upper structure (FIG. 1) laid out on a plane. [Figure 16] 16 is a diagram showing a modified example of the inner upper part (FIG. 15). FIG. [Figure 17] 16 is a diagram showing another modified example of the inner upper part (FIG. 15). FIG. [Figure 18] 16 is a diagram showing a modified example of the upper structure (FIG. 15). FIG. [Figure 19] 16 is a diagram showing another modified example of the upper structure (FIG. 15). FIG. [Figure 20] FIG. 17 is a diagram showing still another modified example of the upper structure (FIG. 15). [Figure 21] FIG. 9 is a diagram showing a modification of FIG. 8. [Figure 22]FIG. 17 is a diagram showing another modified example of the upper structure (FIG. 15), in which the inner upper portion, the outer upper portion and the outer instep side portions of the last (wooden mold) are each developed on a plane. [Diagram 23] FIG. 17 is a diagram showing another modified example of the upper structure (FIG. 15), in which the inner upper portion, the outer upper portion and the inner part of the last (wooden mold) are each developed on a plane. [Figure 24] FIG. 22 is a development view of the inner upper part, the outer upper part, and the inner and outer upper parts of the last of the upper structure (FIGS. 22 and 23) laid out on a plane and arranged facing each other, showing the state before the inner upper part and the outer upper part are sewn together. [Diagram 25] This shows a cross section of the forefoot region in the state in which the upper structure (Figure 24) is placed over the last after the inner upper part and outer upper part of the upper structure have been sewn, and corresponds to Figure 7 of the above embodiment. [Figure 26] This shows a cross-section of the midfoot region in the state in which the upper structure (Figure 24) is placed over the last after the inner upper part and outer upper part of the upper structure have been sewn, and corresponds to Figure 8 of the above embodiment. [Figure 27] FIG. 22 shows another modified example of the upper structure (FIG. 15), in which the inner upper part, the outer upper part, and the outer instep side parts of the last (wooden mold) are each developed on a plane. [Figure 28] FIG. 23 shows yet another modified example of the upper structure (FIG. 15), in which the inner upper portion, the outer upper portion, and the inner part of the last (wooden mold) are each developed on a plane. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Figures 1 to 15 are diagrams for explaining an upper structure according to an embodiment of the present invention and a sports shoe employing the same, in which the sports shoe is an example of an indoor shoe for ball games such as volleyball or handball. Figures 1 to 6 are external views of the shoe (for the right foot), Figures 7 to 9A are cross-sectional views of the shoe, Figures 10 to 13 are diagrams showing the upper structure of the shoe, Figure 14 is a cross-sectional view taken along line XIV-XIV in Figure 10, and Figure 15 is a development view of the upper structure.

[0036] In the following description, the terms "upper" (upper side / top) and "lower" (lower side / lower / bottom) refer to the vertical positional relationship of the shoe, the terms "front" (front side / front part / front) and "rear" (rear side / rear / rear) refer to the front-rear positional relationship of the shoe, and the term "width" refers to the widthwise direction (left-right direction) of the shoe. For example, in the side view of Figure 1, the terms "upper" and "lower" refer to the upper and lower sides of the figure, respectively, the terms "front" and "rear" refer to the left and right sides of the figure, respectively, and the width direction refers to the depth direction of the paper on the figure.

[0037] 1 to 3, shoe 1 includes upper structure 2 extending over the entire length of shoe 1 so as to cover the entire foot of the wearer, and midsole 3 fixed to the lower part of upper structure 2. In each figure, symbols H, M, and F indicate the heel region, midfoot region, and forefoot region of shoe 1, respectively, which correspond to the heel, midfoot (arch), and forefoot of the wearer's foot, respectively.

[0038] The upper structure 2 has an inner upper part 20 arranged on the inside and an outer upper part 21 arranged on the outside, overlapping the inner upper part 20. In this example, the inner upper part 20 is configured to include the tongue of the shoe 1. An opening 10 and a throat part 10a that communicates with the opening 10 and extends forward to the upper area of ​​the dorsum of the foot (i.e., the instep) are formed at the top of the outer upper part 21. Shoelaces 11 as fastening members of the shoe 1 are passed through eyelet holes 2a formed at the left and right opening edge parts of the throat part 10a. An outsole 4 having a contact surface that contacts the floor surface or the like is fixed to the underside of the midsole 3. The midsole 3 and the outsole 4 form the sole of the shoe 1.

[0039] As shown in Figs. 4 to 6, the inner upper part 20 has a portion that covers the throat part 10a of the outer upper part 21 from below and functions as the tongue of the shoe 1, and is extended beyond the throat part 10a to the tip of the toe further forward and to the lower end of the medial and lateral insteps on both the left and right sides (see dotted lines in each figure), and has a forefoot region F and a midfoot region M that cover the forefoot and midfoot regions, respectively. The inner upper part 20 has a main body part 20A arranged to cover substantially the entire area of ​​the dorsum of the foot, and a stretchable part 20B arranged below the main body part 20A and having stretchability. The upper end 20b of the stretchable part 20B is integrally connected to the lower end 20a of the main body part 20A. The inner upper part 20 has stretchability as a whole due to the stretchable part 20B. In contrast, the outer upper part 21 does not have a stretchable part, and therefore the stretchability of the outer upper part 21 is lower than that of the inner upper part 20.

[0040] The rear end 20C of the inner upper part 20 extends obliquely downward toward the lower end of the heel region H. In this example, the stretchable part 20B is provided as a substantially triangular region having an apex on the rear end 20C, and the upper end 20b of the stretchable part 20B and the lower end 20a of the main body part 20A extend obliquely downward toward the front. The lower ends of the main body part 20A and the stretchable part 20B are fixed to the midsole 3. The rearmost end 20Bb of the stretchable part 20B is located at the lower end of the heel region H.

[0041] 7 is a cross-sectional view taken along line VII-VII in FIG. 6, showing a cross-section of the toe region of the inner upper part 20 where the stretchable part 20B is not provided, in which the shoe 1 is shown upside down (i.e., the soles 3 and 4 are on top). As shown in the figure, the lower end 20t of the main body part 20A of the inner upper part 20 is fixed to the lower end 21t of the outer upper part 21 by sewing or the like, and each of the lower ends 20t, 21t is fixed to the midsole 3 and the insole 30 disposed on the upper surface thereof by adhesion, sewing or the like. The outer upper part 21 overlaps with the main body part 20A of the inner upper part 20, but the outer upper part 21 is separated from the main body part 20A of the inner upper part 20 except for the lower end 21t of the outer upper part 21 and the lower end 20t of the main body part 20A.

[0042] In the upside-down state shown in Figure 7, the inner upper part 20 (and the outer upper part 21) is in a free length state, stretched without slack vertically downward (downward as shown) due to its own weight, and at this time, a gap e is formed between the outer surface 20s of the inner upper part 20 and the inner surface 21s of the outer upper part 21.

[0043] In this case, the perimeter of the outer surface 20s of the inner upper portion 20 (i.e., the distance measured in the circumferential direction along the outer surface 20s with one lower end 20t as the starting end and the other lower end 20t as the ending end) is 20L, and similarly, the perimeter of the inner surface 21s of the outer upper portion 21 (i.e., the distance measured in the circumferential direction along the inner surface 21s with one lower end 21t as the starting end and the other lower end 21t as the ending end) is 21L, 20L<21L Therefore, the inner upper part 20 is stretchable inside the outer upper part 21. In this case, it is preferable that 0.5×21L<20L<0.95×21L That is, the perimeter of the outer surface 20s of the inner upper part 20 is greater than 50% and less than 95% of the perimeter of the inner surface 21s of the outer upper part 21. This is because if it is less than 50%, the toes of the foot are too tightly pressed against each other, and if it is more than 95%, sufficient adhesion to the toes of the foot cannot be obtained.

[0044] Fig. 8 is a cross-sectional view of line VIII-VIII in Fig. 6, and shows a cross section passing through the throat portion 10a in a portion of the forefoot region F where the stretchable portion 20B of the inner upper portion 20 is not provided, with the shoe 1 turned upside down, as in Fig. 7. As shown in Fig. 8, the lower end 20t of the main body portion 20A of the inner upper portion 20 is fixed by sewing or the like to the lower ends 211t, 212t of the inner upper side region 211 and the outer upper side region 212 arranged on the left and right sides of the throat portion 10a of the outer upper portion 21, and the lower ends 20t, 211t, 212t are fixed by adhesion, sewing, or the like to the midsole 3 and the insole 30 arranged on the upper surface thereof. In addition, the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21 overlap with the main body part 20A of the inner upper part 20, but except for the lower end 211t of the medial upper side region 211, the lower end 212t of the lateral upper side region 212, and the lower end 20t of the main body part 20A, the outer upper part 21 is separated from the main body part 20A of the inner upper part 20.

[0045] In the upside-down state shown in Figure 8, the inner upper part 20 (and the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21) are in a free length state, stretched vertically downward (downward as shown) without slack due to their own weight, and at this time, gaps e1 and e2 are formed between the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21 and the inner upper part 20, respectively.

[0046] Fig. 9 is a cross-sectional view of line IX-IX in Fig. 6, and shows a cross section passing through the throat portion 10a in the midfoot region M where the stretchable portion 20B of the inner upper part 20 is provided, in a state where the shoe 1 is turned upside down, similar to Fig. 8. As shown in Fig. 9, the lower end 20t of the stretchable portion 20B of the inner upper part 20 is fixed by sewing or the like to the lower ends 211t, 212t of the medial upper region 211 and the lateral upper region 212 arranged on the left and right sides of the throat portion 10a of the outer upper part 21, and the lower ends 20t, 211t, 212t are fixed by adhesion, sewing, or the like to the midsole 3 and the insole 30 arranged on the upper surface thereof. In addition, the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21 overlap with the main body portion 20A of the inner upper part 20, but except for the lower end 211t of the medial upper side region 211, the lower end 212t of the lateral upper side region 212, and the lower end 20t of the stretchable portion 20B, the outer upper part 21 is separated from the main body portion 20A (and the stretchable portion 20B) of the inner upper part 20.

[0047] In the upside-down state shown in Figure 9, the inner upper part 20 (and the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21) are in a free length state, stretched vertically downward (downward as shown) without slack due to their own weight, and at this time, gaps e1 and e2 are formed between the medial upper side region 211 and the lateral upper side region 212 of the outer upper part 21 and the inner upper part 20, respectively.

[0048] Thus, in this embodiment, when the shoe 1 (and therefore the upper structure 2) is turned upside down and the inner upper part 20 is stretched without slack under its own weight at its free length, the inner upper part 20 has gaps e, e1, e2 between it and the outer upper part 21 in the region from the forefoot region F to the midfoot region M.

[0049] 8A is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 3 and corresponds to FIG. 8. That is, FIG. 8A shows the state in which the shoelace 11 is threaded through the eyelet hole 2a in FIG. 8. As shown in the figure, when the shoelace 11 is threaded through, the upper end 211t', which is the end of the throat portion 10a side in the inner instep side region 211 of the outer upper part 21, is disposed in contact with or in a position immediately adjacent to the outer surface 20s of the inner upper part 20, and similarly, the upper end 212t', which is the end of the throat portion 10a side in the outer instep side region 212 of the outer upper part 21, is disposed in contact with or in a position immediately adjacent to the outer surface 20s of the inner upper part 20. Even in this case, gaps e1 and e2 are formed between the inner instep side region 211 and the outer instep side region 212 of the outer upper part 21 and the inner upper part 20, respectively.

[0050] In this case, the perimeter of the inner surface 211s of the inner instep side region 211 of the outer upper part 21 (i.e., the distance measured in the circumferential direction along the inner surface 211s with the lower end 211t as the starting end and the upper end 211t' as the ending end) is 211L, and the corresponding perimeter of the outer surface 20s of the inner upper part 20 (i.e., the distance measured in the circumferential direction along the outer surface 20s with the lower end 20t as the starting end and the position where the upper end 211t' of the inner instep side region 211 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 211t' onto the outer surface 20s) is 201L. 201L<211L It has become.

[0051] Similarly, the perimeter of the inner surface 212s of the instep side region 212 of the outer upper part 21 is 212L (i.e., the distance measured in the circumferential direction along the inner surface 212s, starting from the lower end 212t and ending at the upper end 212t'), and the corresponding perimeter of the outer surface 20s of the inner upper part 20 is 202L (i.e., the distance measured in the circumferential direction along the outer surface 20s, starting from the lower end 20t and ending at the position where the upper end 212t' of the instep side region 212 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 212t' onto the outer surface 20s). 202L<212L It has become. Therefore, the inner upper part 20 is extensible on the inside of each of the medial upper region 211 and the lateral upper region 212 of the outer upper part 21 .

[0052] 9A is a cross-sectional view taken along line IXA-IXA in FIG. 3 and corresponds to FIG. 9. That is, FIG. 9A shows the state in which the shoelace 11 is threaded through the eyelet hole 2a in FIG. 9. As shown in the figure, when the shoelace 11 is threaded through, the upper end 211t', which is the end of the throat portion 10a side in the inner instep side region 211 of the outer upper part 21, is disposed in contact with or in a position immediately adjacent to the outer surface 20s of the inner upper part 20, and similarly, the upper end 212t', which is the end of the throat portion 10a side in the outer instep side region 212 of the outer upper part 21, is disposed in contact with or in a position immediately adjacent to the outer surface 20s of the inner upper part 20. Even in this case, gaps e1 and e2 are formed between the inner instep side region 211 and the outer instep side region 212 of the outer upper part 21 and the inner upper part 20, respectively.

[0053] In this case, the perimeter of the inner surface 211s of the inner instep side region 211 of the outer upper part 21 (i.e., the distance measured in the circumferential direction along the inner surface 211s with the lower end 211t as the starting end and the upper end 211t' as the ending end) is 211L, and the corresponding perimeter of the outer surface 20s of the inner upper part 20 (i.e., the distance measured in the circumferential direction along the outer surface 20s with the lower end 20t as the starting end and the position where the upper end 211t' of the inner instep side region 211 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 211t' onto the outer surface 20s) is 201L. 201L<211L It has become.

[0054] Similarly, the perimeter of the inner surface 212s of the outer instep region 212 of the outer upper part 21 (i.e. ,under End 212t is the starting point Above Let 212L be the distance measured in the circumferential direction along the inner surface 212s, with the end 212t' as the terminal end, and let 202L be the corresponding perimeter of the outer surface 20s of the inner upper part 20 (i.e., the distance measured in the circumferential direction along the outer surface 20s, with the one lower end 20t as the starting end and the position where the upper end 212t' of the outer instep side region 212 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 212t' onto the outer surface 20s). 202L<212L It has become. Therefore, the inner upper part 20 is extensible on the inside of each of the medial upper region 211 and the lateral upper region 212 of the outer upper part 21 .

[0055] The main body 20A of the inner upper part 20 is made of artificial leather, synthetic leather, or a layer of a low-stretch mesh material and a thermoplastic resin, while the stretchable part 20B is made of a highly stretchable material including elastic fibers such as spandex (polyurethane elastic thread). The outer upper part 21 is made of artificial leather, synthetic leather, or a low-stretch mesh material.

[0056] The midsole 3 is made of a soft elastic material, specifically, a thermoplastic synthetic resin such as ethylene-vinyl acetate copolymer (EVA) or its foam, a thermosetting resin such as polyurethane (PU) or its foam, or a rubber material such as butadiene rubber or chloroprene rubber or its foam. The outsole 5 is made of a hard elastic material, specifically, a thermoplastic resin such as thermoplastic polyurethane (TPU) or polyamide elastomer (PAE), a thermosetting resin such as epoxy resin, or a solid rubber.

[0057] 4 and 5 are shown in schematic form in Figures 10 and 11. In each figure, the midsole 3 and outsole 5 are omitted, and only the upper structure 2 is shown. In Figures 10 and 11, the solid lines indicate the inner upper part 20, the dashed lines indicate the outer upper part 21, and the gray colored areas indicate the stretchable part 20B of the inner upper part 20.

[0058] The skeletal structure of the foot is shown in Figures 12 and 13, which are drawings of Figures 10 and 11, respectively. In these figures, the symbols MT indicate the metatarsals, CmB the cuneiform bone, NB the navicular bone, CdB the cuboid bone, TA the talus, and CA the calcaneus, while the symbols LF and TT indicate the Lisfranc joint (tarsometatarsal joint) and Chopart joint (transverse tarsal joint), respectively.

[0059] 12, on the medial side of the foot, the stretchable part 20B is disposed in at least a part of the region extending from the base of the metatarsal bone MT through the cuneiform bone CmB, the navicular bone NB, and the talus TA to the calcaneus CA. In addition, the upper end 20b of the stretchable part 20B intersects at least the Chopart joint TT (or both the Chopart joint TT and the Lisfranc joint LF).

[0060] 13, on the lateral side of the foot, the stretchable part 20B is disposed in at least a part of the region extending from the base of the metatarsal bone MT through the cuboid bone CdB to the calcaneus CA. In addition, the upper end 20b of the stretchable part 20B crosses the cuboid bone CdB and intersects at least the Chopart joint TT (or both the Chopart joint TT and the Lisfranc joint LF).

[0061] FIG. 14 is a cross-sectional view of line XIV-XIV in FIG. 10, showing a cross section of the inner upper part 20 in the midfoot region M and heel region H. As shown in the figure, the main body part 20A and the stretchable part 20B are connected by butting and sewing the opposing end faces. By such butting and sewing, no step or unevenness due to overlapping of materials is formed at the connecting portion, which is the boundary part of the main body part 20A and the stretchable part 20B. In addition, no step or unevenness due to overlapping of materials or thickness change is formed on either the inner surface 20s' or the outer surface 20s of the main body part 20A and the stretchable part 20B, and the main body part 20A and the stretchable part 20B are configured with a substantially flat surface (i.e., a flat surface or a surface that can be considered to be flat) from the forefoot region F through the midfoot region M to the heel region H, and from the medial instep side through the upper part of the foot dorsum to the lateral instep side in each region.

[0062] FIG. 15 is a development view of the inner upper part 20 and the outer upper part 21 constituting the upper structure 2 developed on the same plane, and for convenience of illustration, the inner upper part 20 is shown by a solid line, and the outer upper part 21 is shown by a dashed line. In the figure, the symbols w1 and w2 indicate the size of the inner upper part 20 in the foot width direction in the developed state, and the symbols W1 and W2 indicate the size of the outer upper part 21 in the foot width direction in the developed state, respectively, and the same subscripts indicate the same positions. That is, the symbols w1 and W1 both indicate the size of the foot width direction at the same position in the forefoot region F, and the symbols w2 and W2 both indicate the size of the foot width direction at the same position in the midfoot region M. In the figure, for convenience of illustration, the foot width direction of the inner upper part 20 and the foot width direction of the outer upper part 21 are shown at the same position with a gap therebetween.

[0063] As can be seen from FIG. 15, in the area from the forefoot area to the midfoot area, w1 <W1 w2 <W2 The dimension of the inner upper part 20 in the foot width direction is smaller than the dimension of the outer upper part 21 in the foot width direction.

[0064] Preferably, w2 and W2 satisfy the following relationship: 0.5×W2 <w2<0.95×W2 That is, the dimension of the inner upper part 20 in the foot width direction is greater than 50% and less than 95% of the dimension of the outer upper part 21 in the foot width direction. This is because if it is less than 50%, the midfoot part is too tightly fastened, and if it is more than 95%, sufficient adhesion to the midfoot part of the foot cannot be obtained. In this embodiment, when the total length of the upper structure 2 is L, w2 = 0.80 × W2 at a position 0.2L forward from the rear end of the heel.

[0065] The elongation percentage of the inner upper part 20 is determined in accordance with JIS L 1096 "Testing methods for woven and knitted fabrics." In general, when a test piece of a predetermined length is set in a tensile tester, a tensile load is applied to the test piece, and the length (L1) after loading at a gauge length of a predetermined interval (L0) is measured, and the elongation percentage (%) is calculated using the following formula. Elongation rate (%) = {(L1-L0) / L0}×100 In this embodiment, since the inner upper part 20 is composed of a main body part 20A with low elasticity and an elastic part 20B with high elasticity, the inner upper part 20 itself is set in a tensile tester, and a tensile load is applied, for example, in the foot width direction of the inner upper part 20. The elongation percentage of the inner upper part 20 is preferably 150 to 200%, and in this embodiment, for example, 180% is adopted.

[0066] Next, the effects of this embodiment will be described. In the upper structure 2 according to this embodiment, when the shoe is turned upside down (see FIG. 7), a gap e is formed between the outer surface 20s of the inner upper part 20 and the inner surface 21s of the outer upper part 21 in the toe region (the front part of the forefoot region F), and the perimeter 20L of the outer surface 20s of the inner upper part 20 is smaller than the perimeter 21L of the inner surface 21s of the outer upper part 21. In addition, in the unfolded state (see FIG. 15), the dimension w1 of the inner upper part 20 in the foot width direction is smaller than the dimension W1 of the outer upper part 21 in the foot width direction. Therefore, the inner upper part 20 is stretchable inside the outer upper part 21 in the toe region.

[0067] Similarly, when the shoe is turned upside down (see Figures 8 and 9), gaps e1 and e2 are formed between the medial instep region 211 and the lateral instep region 212 of the outer upper part 21 and the inner upper part 20, respectively, in the forefoot region F and the midfoot region M. At this time, when the shoelace 11 is threaded through the eyelet hole 2a (see Figures 8A and 9A), in the medial upper side region, the perimeter 201L of the outer surface 20s of the inner upper part 20 (i.e., the distance measured circumferentially along the outer surface 20s, starting from the lower end 20t and ending at the position where the upper end 211t' of the medial upper side region 211 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 211t' onto the outer surface 20s) is smaller than the perimeter 211L of the inner surface 211s of the medial upper side region 211 of the outer upper part 21 (i.e., the distance measured circumferentially along the inner surface 211s, starting from the lower end 211t and ending at the upper end 211t'). In addition, in the instep side region, the perimeter 201L of the outer surface 20s of the inner upper part 20 (i.e., the distance measured in the circumferential direction along the outer surface 20s, starting from the lower end 20t and ending at the position where the upper end 212t' of the outer upper part 21 of the outer upper part 21 abuts on the outer surface 20s of the inner upper part 20, or the horizontal projection position of the upper end 212t' onto the outer surface 20s) is smaller than the perimeter 212L of the inner surface 212s of the outer upper part 21 of the outer upper part 21 (i.e., the distance measured in the circumferential direction along the inner surface 212s, starting from the lower end 212t and ending at the upper end 212t'). Furthermore, in the unfolded state (see FIG. 15), the dimension w2 of the inner upper part 20 in the foot width direction is smaller than the dimension W2 of the outer upper part 21 in the foot width direction. Therefore, the inner upper part 20 is stretchable on the inside of the medial instep side region 211 and the lateral instep side region 212 of the outer upper part 21 in the forefoot region F and the midfoot region M.

[0068] When the shoe 1 according to this embodiment is worn, the inner upper part 20 stretches in the gaps e, e1, and e2 in the forefoot region F and midfoot region M, so that the inner upper part 20 exerts a pressing force on the forefoot and midfoot of the foot, thereby improving the fit to the forefoot and midfoot. Moreover, in this case, the stretching of the inner upper part 20 is restricted from the outside by the outer upper part 21, which has low elasticity, so that the support for the forefoot and midfoot of the foot can be improved by the outer upper part 21. In this way, the inner upper part 20 stretches smoothly in the region from the forefoot region F to the midfoot region M, so that the fit and support to the forefoot and midfoot can be improved without giving an uncomfortable feeling to the foot.

[0069] Generally, the individual difference in foot circumference is larger in the midfoot than in the forefoot, so the fit of the upper is more important in the midfoot than in the forefoot. According to this embodiment, it is possible to fit the inner upper part 20 according to individual variations such as flat feet, high arch, low arch, etc. Furthermore, among sports shoes, indoor sports shoes that involve intense lateral movements require high support in the midfoot, and this embodiment can meet such requirements.

[0070] Furthermore, in this embodiment, since the stretchable portion 20B has a triangular shape with an apex on the rear end 20C of the inner upper portion 20, the stretchability of the stretchable portion 20B is greater in the midfoot region M than in the forefoot region F (see Figs. 10 to 13). This allows the stretchable portion 20B to easily conform to the three-dimensional shape of the midfoot.

[0071] In addition, in this embodiment, the inner upper portion 20 is configured with a substantially flat surface in the area from the forefoot region F to the midfoot region M, thereby eliminating the feeling of unevenness, discomfort, or pressure on the foot and preventing the smooth bending of the foot from being hindered, thereby further improving the adhesion and fit to the foot.

[0072] Here, a method for manufacturing the shoes 1 according to the present embodiment will be briefly described. In this case, first, a stretchable fabric for the inner upper part 20 and a less stretchable fabric for the outer upper part 21 are prepared, and each piece of fabric is cut so that when laid out on a flat surface, the dimension of the inner upper part 20 in the foot width direction is smaller than the dimension of the outer upper part 21 in the foot width direction (see Figure 15).

[0073] Next, the outer peripheral edge of the inner upper part 20 is sewn to the outer peripheral edge of the outer upper part 21 to assemble the upper structure 2, and the assembled upper structure 2 is placed over a last (shoe mold) (not shown). Then, the inner upper part 20 is stretched by the last. In this state, the midsole 3 is fixed to the lower part of the upper structure 2, and the outsole 4 is bonded to the bottom surface of the midsole 3.

[0074] Next, the upper structure 2 is removed from the last. Then, the inner upper part 20, which was in a stretched state, returns to its pre-stretched state, and as a result, a gap is formed between the inner upper part 20 and the outer upper part 21. In this manner, the shoe 1 is assembled.

[0075] Modifications of the present invention will be described below. In the drawings showing the following modifications, the same reference numerals as those in the above embodiment denote the same or corresponding parts.

[0076] [First Modification] In the above embodiment, the rear end 20Bb of the stretchable part 20B is disposed at a position slightly forward in the heel region H (see Figs. 4, 5, 10 to 13), but the application of the present invention is not limited to this. The rear end 20Bb of the stretchable part 20B may be disposed at a position toward the rear in the heel region H, for example, at the bottom of the calcaneus CA (Figs. 12 and 13).

[0077] [Second Modification] In the above embodiment, an example was shown in which gaps e1, e2 were formed between the inner upper part 20 and the medial side region 211 and the lateral side region 212 of the outer upper part 21, respectively (see Figures 8, 9, 8A, and 9A), but it is also possible to form only one of these gaps e1, e2.

[0078] [Third Modification] In the above embodiment, the perimeter 201L of the outer surface 20s of the inner upper part 20 is smaller than the perimeter 211L of the inner surface 211s of the medial side region 211 of the outer upper part 21, and the perimeter 202L of the outer surface 20s of the inner upper part 20 is smaller than the perimeter 212L of the inner surface 212S of the lateral side region 212 of the outer upper part 21 (see Figs. 8, 9, 8A, and 9A), but the application of the present invention is not limited thereto. Such a relationship in perimeter between the inner upper part 20 and the outer upper part 21 may be established for only one of the medial side region 211 or the lateral side region 212 of the outer upper part 21.

[0079] [Fourth Modification] In the above embodiment, the main body 20A of the inner upper part 20 is made of a single piece of fabric (see FIG. 15), but the application of the present invention is not limited to this. Figures 16 and 17 show modified examples of the inner upper part 20, each of which corresponds to FIG. 15.

[0080] As shown in Fig. 16, the main body 20A of the inner upper part 20 is composed of three parts divided in the foot width direction and foot length direction, and has a front part 20A1 arranged on the front side and a pair of left and right rear parts 20A2 and 20A3 arranged on the rear side. The rear end 20a1 of the front part 20A1 is formed in a straight line. The rear part 20A2 has a main body 20Ai and an expandable part 20Bi integrally connected thereto. Similarly, the rear part 20A3 has a main body 20Ai and an expandable part 20Bi integrally connected thereto. O and an expandable portion 20B integrally connected thereto. O The front end 20a2 of the main body portion 20Ai and the main body portion 20AO The front end 20a3 of the main body 20Ai is formed in a straight line. i and main body portion 20A O Upper end of the dorsum of the foot 20 c O are all formed in a curved shape, and in this example, are all formed from a convex arc surface (or a convex curved surface).

[0081] When assembling the inner upper part 20 configured in this manner, the front end 20a2 of the main body part 20Ai and the O The front end 20a3 of the front part 20A1 is sewn to the rear end 20a1 of the front part 20A1, and the convex arc-shaped upper end 20c of the main body 20Ai is sewn to the rear end 20a1 of the front part 20A1. i and main body portion 20A O Convex arc-shaped upper end of the dorsum of the foot 20 c O The ends of the pieces are aligned and sewn together. The sewing is performed by using a flat stitch such as a butt stitch as described in the previous embodiment.

[0082] The assembled inner upper portion 20 is made up of main body portions 20Ai and 20A O The boundary portion between the upper structure 2 and the shoe opening 10 extends linearly in the front-rear direction in a plan view and extends in a convex arc shape in a side view. This allows the main body portion 20A of the inner upper portion 20 to be three-dimensional, so that the main body portion 20A can be made to fit the three-dimensional shape of the foot, and since the inner upper portion 20 is already three-dimensionally shaped by the main body portion 20A before the shoe 1 is put on, it becomes easier for the wearer to insert the foot into the opening 10 of the upper structure 2, making it easier to put on the shoe 1.

[0083] In FIG. 17, the main body 20A of the inner upper part 20 is composed of three parts, a front part 20A1 and rear parts 20A2 and 20A3, which is the same as that shown in FIG. 16. However, in this example, the upper end 20c of the main body 20Ai is i and main body portion 20A O Upper end of the dorsum of the foot 20 c OThe curved shape of the upper end 20c of the main body 20Ai is different from that shown in FIG. i and main body portion 20A O Upper end of the dorsum of the foot 20 c O Each of the surfaces is formed of a convex arc surface (or a convex curved surface), but in this example, the upper end 20c of the dorsum of the main body 20Ai i and main body portion 20A O Upper end of the dorsum of the foot 20 c O are formed from a hybrid curved surface that combines a convex arc surface (or a convex curved surface) and a concave arc surface (or a concave curved surface).

[0084] The assembled inner upper portion 20 is made up of main body portions 20Ai and 20A O The boundary portion between the inner upper part 20 and the inner upper part 20 extends linearly in the front-rear direction in a plan view, extends in a convex arc shape in a side view in the front region, and extends in a concave arc shape in a side view in the rear region. This allows the main body part 20A of the inner upper part 20 to be three-dimensional, so that the main body part 20A can be made to fit the three-dimensional shape of the foot, and the inner upper part 20 is already three-dimensionally shaped by the main body part 20A before the shoe 1 is put on, and in particular, the rear end part of the upper part of the instep of the foot of the inner upper part 20 is formed to rise upward, so that it becomes easier for the wearer to insert the foot into the opening 10 of the upper structure 2, making it even easier to put on the shoe 1.

[0085] In the example shown in Figures 16 and 17, after each part is sewn together and the inner upper part 20 is assembled, the main body part 20A has a three-dimensional shape, and therefore the inner upper part 20 cannot be laid out in an unfolded state on a flat surface. However, even in this case, when the outer upper part 21 is placed on the outside of the inner upper part 20 to form the upper structure 2, a gap e1 is formed between the medial upper side region 211 of the outer upper part 21 and the rear part 20A2 of the inner upper part 20, and a gap e2 is formed between the lateral upper side region 212 of the outer upper part 21 and the rear part 20A3 of the inner upper part 20, and the perimeter 201L of the outer surface 20s of the rear part 20A2 of the inner upper part 20 is smaller than the perimeter 211L of the inner surface 211S of the medial upper side region 211 of the outer upper part 21, and the perimeter 202L of the outer surface 20s of the rear part 20A3 of the inner upper part 20 is smaller than the perimeter 212L of the inner surface 212S of the lateral upper side region 212 of the outer upper part 21.

[0086] Although not shown, the upper end 20c of the main body 20Ai i and main body portion 20A O Upper end of the dorsum of the foot 20 c O may be formed only from a concave arc-shaped surface (or a concave curved surface), and the manner in which the convex arc-shaped surface (or convex curved surface) and the concave arc-shaped surface (or concave curved surface) are combined is not limited to that shown in Fig. 17. Furthermore, in the examples shown in Figs. 16 and 17, the main body portion 20A of the inner upper part 20 is composed of three parts, but the number of parts to be divided may be two or four or more. Furthermore, the position at which the main body portion 20A of the inner upper part 20 is divided is not limited to that shown in Figs. 16 and 17.

[0087] [Fifth Modification] Figures 18 to 20 each show a modification of Figure 15. In these modifications, the same reference numerals as in Figure 15 indicate the same or corresponding parts.

[0088] In the example shown in FIG. 18, the lower (i.e., sole side) ends of the respective expandable portions 20B of the inner upper portion 20 do not coincide with the lower (sole side) end of the main body portion 20A, and a main body portion region 20Aa is formed between the lower ends of the respective expandable portions 20B and the lower end of the main body portion 20A, which is different from that shown in FIG. 15. In the example shown in FIG. 19, the respective expandable portions 20B of the inner upper portion 20 are formed in a substantially rectangular shape or a substantially strip shape, which is different from that shown in FIG. 15. Further, the shape of the expandable portion 20B is not limited to the substantially triangular shape as shown in FIG. 15, the substantially rectangular shape or the substantially strip shape as shown in FIG. 19, and other shapes (for example, polygonal shapes, elliptical shapes, oval shapes, etc.) may also be used. In the example shown in FIG. 20, the expandable portions 20B are not continuously provided on the main body portion 20A, which is different from that shown in FIG. 15. In this case, the main body portion 20A is composed of an expandable mesh material, elastic fibers, etc., and has elasticity as a whole.

[0089] 〔Sixth Modification Example〕 FIG. 21 shows a modification example of FIG. 9. In the figure, the same reference numerals as those in FIG. 9 indicate the same or corresponding parts. In the example shown in FIG. 21, the respective lower ends 20t of the main body portion 20A of the inner upper portion 20 are not arranged at the positions of the lower end 211t of the inner armor side region 211 and the lower end 212t of the outer armor side region 212 of the outer upper portion 21, and the respective lower ends 20t are fixed at positions away from the lower end 211t in the inner armor side region 211 and positions away from the lower end 212t in the outer armor side region 212.

[0090] Also in this case, gaps e1 and e2 are respectively formed between the inner armor side region 211 and the outer armor side region 212 of the outer upper portion 21 and the inner upper portion 20.

[0091] 〔Seventh Modification Example〕 In the above embodiment, an example in which in the unfolded state where the inner upper portion 20 and the outer upper portion 21 are unfolded on the same plane, the dimension w in the foot width direction of the inner upper portion 20 is smaller than the dimension W in the foot width direction of the outer upper portion (i.e., w1 < W1) is shown (see paragraph

[0063] and FIG. 15), but the application of the present invention is not limited to this.

[0092] Figures 22 to 26 show a seventh modified example of the present invention. In these figures, the same reference numerals as those in the first embodiment indicate the same or corresponding parts. In this seventh modified example, the inner upper part and the outer upper part are divided by a front-rear center line passing through the upper part of the instep, and each part is composed of an inner part and an outer part.

[0093] Fig. 22 is a plan view of the outer instep side parts of the inner upper part and the outer upper part, and Fig. 23 is a plan view of the inner upper part and the inner upper part, each of which is shown with the outer instep side part / instep side part of the last (wooden form) laid out on a flat surface. Fig. 24 is a plan view of the outer instep side parts (Fig. 22) and inner instep side parts (Fig. 23) of the inner upper part, the outer upper part, and the last, with their upper edges facing each other, showing the state before sewing the upper edges of the inner upper part and the outer upper part. Fig. 25 is a cross-sectional view of the forefoot region in a state in which the upper edge parts of the outer instep side parts and inner instep side parts of the inner upper part and the outer upper part of the upper structure (Fig. 24) are sewn together and placed over the last, and the lower edges of the outer instep side parts and inner instep side parts are sewn to the midsole. Fig. 26 is a cross-sectional view of the midfoot region in a state where the upper structure (Fig. 24) is covered with a last, with the upper edges of the outer and inner parts sewn together, and the lower edges of the outer and inner parts sewn together to a midsole. In Figs. 25 and 26, the upper structure is shown upside down.

[0094] As shown in Fig. 22, the outer instep side part 20o (thick solid line part) of the inner upper part has a main part 20Ao arranged so as to cover almost the entire area of ​​the outer instep side of the wearer's foot, and a stretchable part 20Bo (gray colored part) arranged below the main part 20Ao and integrally connected to the main part 20Ao, and has stretchability, and the arrangement area of ​​the stretchable part 20Bo is almost the same as that of the above embodiment. The outer instep side part 21o (dotted chain line part) of the outer upper part is arranged on the outside of the outer instep side part 20o of the inner upper part (the front side of the paper in the figure), has a throat part 10a, overlaps with the outer instep side part 20o of the inner upper part, and extends to the heel area behind the outer instep side part 20o. The outer instep side portion 20o of the inner upper part has elasticity as a whole due to the instep side portion 20Bo, but the outer instep side portion 21o of the outer upper part does not have an elasticity portion, and therefore the elasticity of the outer instep side portion 21o of the outer upper part is lower than the elasticity of the outer instep side portion 20o of the inner upper part.

[0095] As shown in Fig. 23, the inner upper part 20i (thick solid line part) has a main part 20Ai arranged so as to cover almost the entire area of ​​the inner upper side of the wearer's dorsum of the foot, and a stretchable part 20Bi (gray colored part) arranged below the main part 20Ai and integrally connected to the main part 20Ai, and has stretchability, and the arrangement area of ​​the stretchable part 20Bi is almost the same as that of the above embodiment. The inner upper part 21i (dotted chain line part) of the outer upper part is arranged outside the inner upper part 20i of the inner upper part (the front side of the paper in the figure), has a throat part 10a, overlaps with the inner upper part 20i of the inner upper part, and extends to the heel area behind the inner upper part 20i. The inner upper part's inner side portion 20i has elasticity as a whole due to the insole 20Bi, but the inner upper part's inner side portion 21i has no elasticity, and therefore the elasticity of the inner upper part's inner side portion 21i is lower than the elasticity of the inner upper part's inner side portion 20i.

[0096] In Figure 22, the outer peripheral edge (dotted line) of the outer instep side portion 21o of the outer upper part coincides with the outer peripheral edge (thick solid line) of the outer instep side portion 20o of the inner upper part, except for the throat portion 10a and the heel region; similarly, in Figure 23, the outer peripheral edge (dotted line) of the inner instep side portion 21i of the outer upper part coincides with the outer peripheral edge (thick solid line) of the inner instep side portion 20i of the inner upper part, except for the throat portion 10a and the heel region. That is, in the front end portion of the forefoot region (area including the toes), the upper edges of the lateral instep side portion 21o and medial instep side portion 21i of the outer upper part respectively coincide with the upper edges of the lateral instep side portion 20o and medial instep side portion 20i of the inner upper part, and in the region from the forefoot region to the midfoot region, the lower edges of the lateral instep side portion 21o and medial instep side portion 21i of the outer upper part respectively coincide with the lower edges of the lateral instep side portion 20o and medial instep side portion 20i of the inner upper part.

[0097] Here, the foot width direction dimension w1 of the forefoot area of ​​the inner upper part is the sum of the foot width direction dimension wo1 (Fig. 22) of the outer instep side part 20o of the inner upper part and the foot width direction dimension wi1 (Fig. 23) of the forefoot area of ​​the inner upper part, and the foot width direction dimension Wo1 (Fig. 22) of the forefoot area of ​​the outer upper part 21o of the outer upper part and the foot width direction dimension Wi1 (Fig. 23) of the forefoot area of ​​the inner upper part. In this seventh modified example, as can be seen from Figs. 22 and 23, in the forefoot area, wo1=Wo1 and wi1=Wi1 Therefore, wo1+wi1=Wo1+Wi1 Therefore, w1=W1 This is different from the first embodiment.

[0098] As shown in Fig. 22, the lower edge of the outer instep side part 20o of the inner upper part and the lower edge of the outer instep side part 21o of the outer upper part are extended further below the lower edge of the outer instep side part Lao (thin solid line part) of the last, and this extended part Pr is indicated by hatching. As shown in Fig. 23, the lower edge of the inner instep side part 20i of the inner upper part and the lower edge of the inner instep side part 21i of the outer upper part are extended further below the lower edge of the inner instep side part Lai of the last, and this extended part Pr is indicated by hatching. These extended parts Pr are parts for wrapping the inner upper part and the outer upper part around the bottom surface of the last when the inner upper part 20 and the outer upper part 21 are placed on the last during shoe assembly.

[0099] Also, as shown in Fig. 22, if the dimension in the foot width direction of the forefoot region of the outer instep side part Lao of the last is Lo1, the corresponding dimension in the foot width direction of the outer instep side part 20o of the inner upper part and the dimension in the foot width direction of the outer instep side part 21o of the outer upper part are smaller than the dimension in the foot width direction of the forefoot region of the outer instep side part Lao of the last. do1 <Lo1および Do1<Lo1 Similarly, as shown in Fig. 23, if the foot width direction dimension of the forefoot area of ​​the inner instep side part Lai of the last is Li1, the foot width direction dimension di1 of the inner instep side part 20i of the inner upper part and the foot width direction dimension Di1 (=di1) of the inner instep side part 21i of the outer upper part are smaller than the foot width direction dimension Li1 of the forefoot area of ​​the inner instep side part Lai of the last. di1 <Li1および Di1<Li1

[0100] Furthermore, as shown in Fig. 22, if the dimension in the foot width direction of the midfoot region of the outer instep side part Lao of the last is Lo2, the dimension in the foot width direction of the outer instep side part 20o of the inner upper part corresponding to this is smaller than the dimension in the foot width direction Lo2 of the midfoot region of the outer instep side part Lao of the last. do2 <Lo2 Similarly, as shown in Fig. 23, if the foot width direction dimension of the midfoot region of the medial side part Lai of the last is Li2, the foot width direction dimension di2 of the medial side part 20i of the inner upper part corresponding thereto is smaller than the foot width direction dimension Li2 of the midfoot region of the medial side part Lai of the last. di2 <Li2

[0101] As shown in Fig. 24, the outer instep side parts (Fig. 22) and inner instep side parts (Fig. 23) of the inner upper part and the outer upper part are arranged with their upper edges facing each other, and the upper edges of the outer instep side part and the inner instep side part of the inner upper part are sewn together, and the resulting product is placed over a last (shoe mold) La (see Figs. 25 and 26). Next, the lower end 20t of the inner upper part and the lower end 21t of the inner upper part are fixed to the end of the midsole 20 by gluing, sewing, or the like.

[0102] At this time, as shown in FIG. 25, in the forefoot region, the outer surface 20s of the inner upper part 20 consisting of the outer instep side part 20o and the inner instep side part 20i and the inner surface 21s of the outer upper part 21 consisting of the outer instep side part 21o and the inner instep side part 21i are in close contact with each other, and no gap is formed between the two surfaces. The last La is composed of a substantially flat bottom surface Lab, a medial instep side Lai extending upward (lower in FIG. 25) from the medial instep side end of the bottom surface Lab, and a lateral instep side Lao extending upward (lower in FIG. 25) from the lateral instep side end of the bottom surface Lab. The bottom surface Lab has an area corresponding to each extension portion Pr of the inner upper part 20 and the outer upper part 21. The medial instep side Lai and the lateral instep side Lao are smoothly connected to each other at the upper part of the foot dorsum. The inner surface of the inner upper part 20 abuts against the outer surface of the last La along the circumferential direction, that is, the medial instep side Lai and the lateral instep side Lao.

[0103] 26, in the midfoot region, the inner upper part 20 (and the medial side region 211 and the lateral side region 212 of the outer upper part 21) are in a free length state stretched vertically downward (downward in the figure) by their own weight, and at this time, gaps e1 and e2 are formed between the medial side region 211 and the lateral side region 212 of the outer upper part 21 and the inner upper part 20, respectively. Each extension part Pr of the inner upper part 20 abuts against the bottom surface Lab of the last La, and the inner surface of the inner upper part 20 abuts against the outer surface of the last La, that is, the medial side surface Lai and the lateral side surface Lao, along the circumferential direction.

[0104] Next, a manufacturing method of the upper structure 2 will be briefly described. First, fabric for the inner upper part 20 and fabric for the outer upper part 21 are prepared, cut, and appropriately sewn to prepare the outer instep side portion 20o of the inner upper part 20 consisting of the main body portion 20Ao and the stretchable portion 20Bo, the inner instep side portion 20i of the inner upper part 20 consisting of the main body portion 20Ai and the stretchable portion 20Bi, and the outer instep side portion 21o and the inner instep side portion 21i of the outer upper part 21 (see Figures 22 and 23).

[0105] Next, the upper edges of the main body portion 20Ao of the outer instep side portion 20o of the inner upper part 20 and the main body portion 20Ai of the inner instep side portion 20i are arranged opposite each other (see Figure 24) and sewn together to produce the inner upper part 20, and the upper edges of the outer instep side portion 21o and the inner instep side portion 21i of the outer upper part 21 are arranged opposite each other (see the same figure) and sewn together to produce the outer upper part 21, and the lower edges of the outer instep side portion 20o of the inner upper part 20 and the lower edges of the outer instep side portion 21o of the outer upper part 21 are sewn together, and the lower edges of the inner instep side portion 20i of the inner upper part 20 and the lower edges of the inner instep side portion 21i of the outer upper part 21 are sewn together to form the upper part of the upper structure 2.

[0106] Next, place the assembled upper structure 2 over the last (shoe form) (see FIGS. 25 and 26). Then, the inner upper portion 20 is extended by the last La, and the inner surface of the inner upper portion 20 comes into close contact with the outer surface of the last La. From that state, place the midsole 30 on the bottom surface Lab of the last La, and fix the lower end 20t of the inner upper portion 20 and the lower end 21t of the outer upper portion 21 to the outer peripheral edge portion of the midsole 30 by sewing or the like (see FIGS. 25 and 26). Thereby, the upper structure 2 is assembled. Next, the shoe is assembled by adhering the midsole 3 and the outsole 4 to the lower portion of the midsole 30 of the upper structure 2.

[0107] In the upper structure 2, as described above, the inner upper portion 20 has expansion and contraction portions 20B i , 20Bo on the inner and outer upper sides respectively. With respect to the dimension Lo1 in the foot width direction in the forefoot region of the outer upper side portion Lao of the last La, the dimension do1 in the foot width direction of the outer upper side portion 20o of the inner upper portion 20 and the dimension Do1 in the foot width direction of the outer upper side portion 21o of the outer upper portion 21 are smaller (do1 < Lo1, Do1 < Lo1) (see FIG. 22). With respect to the dimension Li1 in the foot width direction in the forefoot region of the inner upper side portion Lai of the last La, the dimension di1 in the foot width direction of the inner upper side portion 20i of the inner upper portion 20 and the dimension Di1 in the foot width direction of the inner upper side portion 21i of the outer upper portion 21 are smaller (di1 < Li1, Di1 < Li1) (see FIG. 23). At the same time, with respect to the dimension Lo2 in the foot width direction in the midfoot region of the outer upper side portion Lao of the last La, the dimension do2 in the foot width direction of the outer upper side portion 20o of the inner upper portion 20 is smaller (do2 < Lo2) (see FIG. 22). With respect to the dimension Li2 in the foot width direction in the midfoot region of the inner upper side portion Lai of the last La, the dimension di2 in the foot width direction of the inner upper side portion 20i of the inner upper portion 20 is smaller (di2 < Li2) (see FIG. 23). Thereby, the inner upper portion 20 is configured to be extendable inside the outer upper portion 21.

[0108] Therefore, when the shoe 1 is worn, the inner upper part 20 stretches in the forefoot region and the midfoot region in the same manner as when the last La is inserted inside the upper structure 2, and the inner upper part 20 exerts a pressing force on the forefoot and the midfoot of the foot, thereby improving the fit to the forefoot and the midfoot. Moreover, in this case, the stretch of the inner upper part 20 is restricted from the outside by the outer upper part 21, which has low elasticity, and therefore the support to the forefoot and the midfoot of the foot can be improved by the outer upper part 21. In this way, the inner upper part 20 stretches smoothly in the region from the forefoot region to the midfoot region (particularly the midfoot region), and thus the fit and support to the region from the forefoot region to the midfoot region (particularly the midfoot region) can be improved without giving an uncomfortable feeling to the foot.

[0109] [Eighth Modification] In the seventh modified example, an example was shown in which the foot width direction dimensions of the inner upper part 20 and the outer upper part 21 are smaller than the foot width direction dimensions of the last La in both the forefoot region and the midfoot region (see Figures 22 and 23), but the application of the present invention is not limited to this.

[0110] 27 and 28 show an eighth modification of the present invention, which correspond to FIGS. 22 and 23 of the seventh modification, respectively. In this eighth modification, as shown in FIG. ,stomachThe lower edge of the outer instep side portion 20o of the inner upper part and the lower edge of the outer instep side portion 21o of the outer upper part coincide with the lower edge of the outer instep side portion Lao (thin solid line portion) of the last along the entire length of the shoe, and the upper edge of the outer instep side portion 20o of the inner upper part and the upper edge of the outer instep side portion 21o of the outer upper part coincide with the upper edge of the outer instep side portion Lao of the last in the front end portion of the forefoot area (area including the toe area). Also, as shown in FIG. 28, the lower edge of the medial side portion 20i of the inner upper part and the lower edge of the medial side portion 21i of the outer upper part coincide with the lower edge of the medial side portion Lai of the last along the entire length of the shoe, and the upper edge of the medial side portion 20i of the inner upper part and the upper edge of the medial side portion 21i of the outer upper part coincide with the upper edge of the medial side portion Lai of the last in the front end portion of the forefoot area (area including the toe area).

[0111] Therefore, in this eighth modified example, as shown in Fig. 27, the foot width direction dimension Lo1 of the forefoot region of the outer instep side part Lao of the last is equal to the foot width direction dimension do1 of the outer instep side part 20o of the inner upper part corresponding thereto and the foot width direction dimension Do1 (=do1) of the outer instep side part 21o of the outer upper part. do1=Lo1 and Do1=Lo1 Similarly, as shown in Fig. 28, the foot width direction dimension Li1 of the forefoot region of the inner instep side part Lai of the last is equal to the foot width direction dimension di1 of the inner instep side part 20i of the inner upper part corresponding thereto and the foot width direction dimension Di1 (=di1) of the inner instep side part 21i of the outer upper part. That is, di1=Li1 and Di1=Li1

[0112] On the other hand, as shown in Fig. 27, the dimension Lo2 in the foot width direction of the midfoot region of the outer instep side part Lao of the last is larger than the dimension do2 in the foot width direction of the outer instep side part 20o of the corresponding inner upper part. do2 <Lo2 Similarly, as shown in Fig. 28, the dimension Li2 in the foot width direction of the midfoot region of the medial side part Lai of the last is larger than the dimension di2 in the foot width direction of the medial side part 20i of the inner upper part corresponding thereto. di2 <Li2

[0113] In this way, in the eighth modified example, the dimensions of the inner upper part 20 and the outer upper part 21 in the foot width direction are smaller than the dimension of the last La in the foot width direction only in the midfoot region, so that when the shoe 1 is worn, the inner upper part 20 stretches in the midfoot region, whereby the inner upper part 20 exerts a pressing force on the midfoot part of the foot, thereby improving the fit to the midfoot part. Moreover, in this case, the stretch of the inner upper part 20 is restricted from the outside by the outer upper part 21, which has low elasticity, so that the support for the midfoot part of the foot can be improved by the outer upper part 21. In this way, the inner upper part 20 stretches smoothly in the midfoot region, whereby the fit and support for the midfoot region can be improved without giving an uncomfortable feeling to the foot.

[0114] <Other Modifications> The above-described embodiment and each modification should be considered in all respects as merely illustrative of the present invention, and not restrictive. Those skilled in the art to which the present invention pertains may, when considering the teachings above, construct various modifications and other embodiments that incorporate the principles of the present invention without departing from the spirit and essential characteristics of the present invention, even if not expressly described herein.

[0115] <Other application examples> In the above embodiment and each of the modified examples, the present invention is applied to indoor shoes for ball games such as volleyball and handball, but the present invention can also be applied to indoor shoes for racket sports such as tennis, badminton, table tennis, etc. Furthermore, the present invention can also be applied to other sports shoes and shoes. [Industrial Applicability]

[0116] INDUSTRIAL APPLICABILITY As described above, the present invention is useful for an upper structure for improving the fit and support of the forefoot and midfoot of a wearer in shoes, particularly sports shoes, and especially indoor shoes. [Explanation of symbols]

[0117] 1: Indoor shoes (shoes) 10: Opening 10a: Throat 11: Shoelace (fastening member) 2: Upper structure 20: Inner upper part 20A: Main body 20B: Telescopic part 20L, 20L1, 20L2: perimeter of outer surface 20i: Inner upper part of the inner shell 20o: Outer side of the inner upper 20A i : Inner shell part of the main body 20Ao: Outer shell part of the main body 20B i : The inner part of the stretchable part 20Bo: The outer shell part of the stretchable part 21: Outer upper part 211: Medial region 212: Lateral carpal area 21L, 21L1, 21L2: perimeter of inner surface 21i: Inner part of the outer upper 21o: Outer side of the outer upper La: Last Lai: The inner part of the last Lao: The outer part of the last e, e1, e2: void w1, w2: Dimensions of the inner upper part in the foot width direction W1, W2: Foot width measurement of the outer upper part Lo1, Lo2: The measurement of the outer part of the last in the width direction of the foot Li1, Li2: Foot width measurement of the inner part of the last do1, do2: The measurement of the outer part of the inner upper part in the foot width direction di1, di2: Foot width measurement of the inner upper part Do1: The measurement of the outer part of the upper part in the width direction of the foot Di1: The measurement of the inner part of the outer upper part in the foot width direction F: Forefoot area M: Midfoot area [Prior art documents] [Patent documents]

[0118] [Patent Document 1] U.S. Patent No. 4,438,574 (see column 4, lines 32-39 and FIGS. 1-4, column 3, lines 11-13, 17-21, and 60-63)

Claims

1. A shoe having an upper structure and a midsole, The upper structure includes: an inner upper part that is disposed inside the upper structure, has a forefoot region that covers a forefoot portion of the wearer's foot and a midfoot region that covers a midfoot portion, and has elasticity; an outer upper part having a lower elasticity than the inner upper part, disposed outside the upper structure, overlapping the inner upper part, and having its lower ends on the inner and outer instep sides fixed to the midsole; When the upper structure is turned upside down and the inner upper part is stretched by its own weight without slack in a free length state, the inner upper part has a gap between it and the outer upper part at least in the midfoot region, In the midfoot region, each lower end of the inner upper part on the medial and lateral instep sides is connected to the outer upper part on the medial and lateral instep sides and is fixed to the midsole via the outer upper part. These shoes are characterized by:

2. A shoe having an upper structure and a midsole, The upper structure includes: an inner upper part that is disposed inside the upper structure, has a forefoot region that covers a forefoot portion of the wearer's foot and a midfoot region that covers a midfoot portion, and has elasticity; an outer upper part having a lower elasticity than the inner upper part, disposed outside the upper structure, overlapping the inner upper part, and having its lower ends on the inner and outer instep sides fixed to the midsole; When the inner upper portion and the outer upper portion are laid out on a plane, a dimension of the inner upper portion in a foot width direction is smaller than a dimension of the outer upper portion in a foot width direction at least in the midfoot region, In the midfoot region, each lower end of the inner upper part on the medial and lateral instep sides is connected to the outer upper part on the medial and lateral instep sides and is fixed to the midsole via the outer upper part. These shoes are characterized by:

3. A shoe having an upper structure and a midsole, The upper structure includes: an inner upper part that is disposed inside the upper structure, has a forefoot region that covers a forefoot portion of the wearer's foot and a midfoot region that covers a midfoot portion, and has elasticity; an outer upper part having a lower elasticity than the inner upper part, disposed outside the upper structure, overlapping the inner upper part, and having its lower ends on the inner and outer instep sides fixed to the midsole; when the inner upper portion and the outer upper portion are laid out on a plane and a last of the upper structure is laid out on the plane, at least in the midfoot region, a dimension in a foot width direction of the inner upper portion corresponding to a dimension in a foot width direction of the last is smaller than the dimension in the foot width direction of the last, In the midfoot region, each lower end of the inner upper part on the medial and lateral instep sides is connected to the outer upper part on the medial and lateral instep sides and is fixed to the midsole via the outer upper part. These shoes are characterized by:

4. In claim 1, A throat portion is formed in the upper region of the instep of the outer upper portion, communicating with an opening of the foot and extending in the front-rear direction, and when the open edge of the throat portion of the outer upper portion is in contact with the outer surface of the inner upper portion in the upside-down state, a gap is formed at least either between the outer instep side region of the outer upper portion and the outer instep side region of the inner upper portion on the outer instep side of the throat portion, or between the inner instep side region of the outer upper portion and the inner instep side region of the inner upper portion on the inner instep side of the throat portion. These shoes are characterized by:

5. In claim 1, A throat portion is formed in the upper region of the instep of the outer upper portion, the throat portion being connected to an opening of the foot and extending in the front-rear direction, and when a cross section of the forefoot region and the midfoot region of the upper structure is taken in a state where an opening edge of the throat portion of the outer upper portion is abutted against an outer surface of the inner upper portion in the upside-down state, in at least one of the medial instep region and the lateral instep region across the throat portion, a circumferential length from a lower end of the inner surface of the outer upper portion to the opening edge of the throat portion is longer than a circumferential length from a lower end of the outer surface of the inner upper portion to a position where the opening edge of the throat portion abuts against the opening edge of the throat portion. These shoes are characterized by:

6. In any one of claims 1 to 3, A throat portion is formed in an upper region of the instep of the outer upper portion, the throat portion being connected to an opening of the foot and extending in a front-rear direction, and a fastening member for fastening the foot is provided in the throat portion; The inner upper part extends in a circumferential direction from the medial side region through the instep upper region to the lateral side region in the forefoot region and the midfoot region, and the outer upper part is stretchable inside the outer upper part when the outer upper part is fastened by the fastening member and an opening edge portion of the throat portion of the outer upper part is in contact with an outer surface of the inner upper part. These shoes are characterized by:

7. In any one of claims 1 to 3, The inner upper portion has a higher stretchability in the midfoot region than in the forefoot region. These shoes are characterized by:

8. In any one of claims 1 to 3, The inner upper portion has a substantially flat surface in a region from the forefoot region to the midfoot region. These shoes are characterized by:

9. In any one of claims 1 to 3, The inner upper portion has a main body portion and a stretchable portion having stretchability, and no step is formed at the boundary between the main body portion and the stretchable portion. These shoes are characterized by:

10. In any one of claims 1 to 3, The inner upper part has a main body part and a stretchable part having stretchability, and the main body part is configured by connecting a plurality of parts divided in the foot width direction or the foot length direction. These shoes are characterized by:

11. In any one of claims 1 to 3, In the midfoot region, the inner upper portion does not have a bottom portion. These shoes are characterized by:

12. In any one of claims 1 to 3, The inner upper part has the stretchable part on each lower part of the inner and outer upper sides. These shoes are characterized by:

13. A method for manufacturing a shoe having an upper structure and a midsole, comprising: the upper structure includes an inner upper part that is disposed inside the upper structure, has a forefoot region that covers a forefoot region of a wearer's foot and a midfoot region that covers a midfoot region, and has elasticity; and an outer upper part that is disposed outside the upper structure, overlaps with the inner upper part, and has lower elasticity than the inner upper part; The manufacturing method comprises: providing the inner upper portion and the outer upper portion; assembling the upper structure by sewing each lower end of the inner upper portion to the outer upper portion; a step of covering the upper structure with a last to stretch the inner upper part, and in this state, fastening each lower end of the inner upper part on the medial and lateral instep sides to the midsole, thereby fastening each lower end of the inner upper part on the medial and lateral instep sides to the midsole via the outer upper part in the midfoot region; a step of removing the upper structure from the last, thereby contracting the inner upper portion, which was in a stretched state, to a state before stretching, and forming a gap between the inner upper portion and the outer upper portion; A method for manufacturing shoes comprising the steps of:

14. In claim 13, When the inner upper part and the outer upper part are laid out on a plane and the last is laid out on a plane, at least in the midfoot region, a dimension in a foot width direction of the inner upper part corresponding to a dimension in a foot width direction of the last is smaller than the dimension in the foot width direction of the last. A method for manufacturing shoes.

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