Insole

Abstract

To provide an insole for supporting a longitudinal arch on the inside of a foot, preventing a user from feeling tightness even when it is put in a shoe with high designability such as men's shoes or pumps, not shifting its position in the shoe during use, and capable of preventing collapse of a body part due to a load.SOLUTION: An insole 10 includes: a body part 20 having flexibility and disposed on a sole of a shoe 70 inward from a center in the width direction of a foot 60 during use; an inner longitudinal arch support part 21 curvedly provided on the body part 20 to support the arch of the foot and form an inner longitudinal arch of the foot 60; an arch collapse prevention part 22 provided on the body part 20, protruding outward from the rear of the inner longitudinal arch support part 21, and preventing the inner longitudinal arch support part 21 from collapsing when being stepped on by a heel 63 of the foot 60; a heel hollowed-out part 23 formed by hollowing out from an outer rear portion of the inner longitudinal arch support part 21 to a front center portion of the arch collapse prevention part 22; and an outer longitudinal arch space 26 having no part for supporting the outer longitudinal arch.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to an insole that is placed in a shoe to support the ball of the foot and form an arch.

Background Art

[0002] A human foot has multiple bones, and when they are correctly arranged without distortion, normal walking and standing are possible. The arrangement of the foot bones is distorted due to aging, foot injuries, etc., and as a result, foot problems such as flat feet occur. The distortion of the foot bones is structural and cannot be improved by medicine, poultices, etc., and it is necessary to correct the structure of the foot bones by approaching from the sole of the foot using an insole or the like.

[0003] In addition, in an insole, not only is the importance of the heel cup, which is the structure of the inner surface part that contacts the human foot, self-evident, but the structure of the outer surface part that contacts the shoe is also important.

[0004] A human foot has multiple bones combined in an arch shape to support the body weight and disperse impacts, etc., and a plantar fascia is formed along the arch of the sole of the foot. Specifically, as shown in FIG. 4, three arches are formed in a human foot 60, an outer longitudinal arch 64 connecting the base of the little toe and the heel, an inner longitudinal arch 65 connecting the base of the thumb, generally called the ball of the foot, and the heel, and a transverse arch 66 connecting the bases of the five toes.

[0005] Among these arches, the inner longitudinal arch 65 loses muscle strength with aging, and when the heel bone falls inward, it collapses, and the ball of the foot part touches the ground, resulting in so-called flat feet. When flat feet occur, the feet become easily fatigued and foot disorders are likely to occur. Conventionally, in order to prevent such a collapse of the arch of the sole of the foot, a pad for lifting the ball of the foot part has been provided on the insole, or a convex shape for lifting the ball of the foot part has been formed. An insole having a convex shape that serves as such a pad for lifting the ball of the foot part has been proposed (Patent Document 1).

[0006] The insole of Patent Document 1 is provided with a raised insole instep corresponding region that aligns the three arches of the foot skeleton, namely the transverse arch, the inner longitudinal arch, and the outer longitudinal arch, on the surface that contacts the back of the foot. A corner cup portion is formed from the rearfoot corresponding region to the midfoot corresponding region, and on the back side, an inclined region is provided in the range from the outer side of the foot in the rearfoot corresponding region to the position facing the straight line connecting the position on the inner side of the foot near the rear end of the midfoot corresponding region to the position on the inner side of the foot at the rear end of the rearfoot corresponding region. It is like this.

[0007] However, when the pad for lifting the instep with the pad has hardness, the inner longitudinal arch for absorbing shock when applying weight cannot function. Therefore, for the portion that supports the inner longitudinal arch (instep) of the foot, a member such as a flexible resin is preferable. Generally, an insole is made to support the entire back of the foot like the insole of Patent Document 1, but when inserting a separate new insole into highly designed shoes such as men's dress shoes and women's pumps, the inside of the shoe becomes tight.

[0008] In order not to make the inside of the shoe tight, if an insole that supports only the inner longitudinal arch (instep) portion is used, it is conceivable that the insole may shift from the inner longitudinal arch in the shoe, or the insole may be pushed by the weight from above and fall in the shoe.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] In view of the above points, the present invention aims to provide an insole that supports the longitudinal arch (arch) on the inner side of the foot, does not become tight even when inserted into highly designed shoes such as men's shoes and pumps, and can prevent the insole from shifting in position inside the shoe and falling during use.

Means for Solving the Problems

[0011] According to an embodiment of the present invention, there is provided an insole that is inserted into a shoe to support the arch of the foot and form an arch, which has flexibility and is disposed on the sole of the shoe during use from the central portion in the width direction of the foot toward the inner side, a main body portion, a medial longitudinal arch support portion that is curved and provided on the main body portion to support the arch during use and form a longitudinal arch on the inner side of the foot, an arch fall prevention portion that protrudes outward from the rear of the medial longitudinal arch support portion on the main body portion and is stepped on by the heel of the foot during use to prevent the medial longitudinal arch support portion from falling, and a heel cutout portion formed by cutting out from the outer rear portion of the medial longitudinal arch support portion to the front central portion of the arch fall prevention portion, and is characterized by being formed in a J shape in plan view.

[0012] Generally, in an insole, projections are provided on the insole under names such as "outer longitudinal arch pad" and "cuboid bone pad" to support the outer longitudinal arch for purposes such as improving the stability of the foot. However, in the present invention, in order to be applicable to more types of shoes, the insole can be made thinner and narrower. Therefore, a portion for supporting the outer longitudinal arch is not provided, and a notch is made in the portion corresponding to the outer longitudinal arch, and the insole is installed. According to the configuration of the present invention, the insole is provided with an inner longitudinal arch support portion that is curved in the main body portion and supports the ball of the foot during use to form the inner longitudinal arch of the foot, and an arch fall prevention portion that protrudes outward from the rear of the inner longitudinal arch support portion in the main body portion and is stepped on by the heel of the foot during use to prevent the inner longitudinal arch support portion from falling. Therefore, the inner longitudinal arch support portion supports the inner longitudinal arch (ball of the foot) of the foot, and by stepping on the arch fall prevention portion with the heel, it is possible to prevent the insole from shifting in position and falling in the shoe during use. Furthermore, the insole has flexibility and is provided with a main body portion that is arranged inside from the central portion in the width direction of the foot on the sole of the shoe during use, and an inner longitudinal arch support portion that is curved in the main body portion and supports the ball of the foot during use to form the inner longitudinal arch of the foot. By doing so, the insole is arranged only inside from the central portion in the width direction of the foot where a space is created by the ball of the foot during use, and there is nothing on the outside from the central portion in the width direction of the foot where a space cannot be created and it becomes tight. Therefore, even when placed in highly designed shoes such as men's shoes and pumps, it can be prevented from becoming tight.

[0013] Furthermore, the insole is provided such that the arch inversion prevention part protrudes outward from behind the inner longitudinal arch support part to the main body part and is formed in a J shape in plan view. Therefore, only the heel part that cannot be pressed by the upper of the shoe during use is formed over the entire width direction of the foot, and the shoe does not become tight even when worn. By providing a heel cutout formed by cutting out from the outer rear part of the inner longitudinal arch support part to the front central part of the arch inversion prevention part, a space for the most bulging part at the bottom of the heel is secured. Thus, even when placed in highly designed shoes such as dress shoes and pumps, it can be made not to become tighter. In this way, the insole of the present invention is configured to be compact with the minimum possible shape, supports the longitudinal arch (arch) on the inner side of the foot, does not become tight even when placed in highly designed shoes such as dress shoes and pumps, and can prevent the position from shifting and falling within the shoe during use.

[0014] Preferably, the main body part is characterized in that an outer longitudinal arch space without a part for supporting the outer longitudinal arch of the foot is formed outside the inner longitudinal arch support part.

[0015] According to such a configuration, since an outer longitudinal arch space without a part for supporting the outer longitudinal arch of the foot is formed outside the inner longitudinal arch support part, while giving priority to maintaining the function of the inner longitudinal arch without providing a part for supporting the outer longitudinal arch, the insole can be made as compact as possible so that it does not become tighter even when placed in highly designed shoes such as dress shoes and pumps.

[0016] Preferably, the bottom surface of the arch inversion prevention part is provided with an angle adjustment part for correcting the inclination of the heel in the range of 0 degrees to 30 degrees.

[0017] According to such a configuration, since the bottom surface of the arch inversion prevention part is provided with an angle adjustment part for correcting the inclination of the heel in the range of 0 degrees to 30 degrees, the alignment of the heel bone can be adjusted by giving an inclination to the insole itself. The angle adjustment part can form an inclination in the insole in the range of 0 degrees to 30 degrees according to the symptoms of each foot, and can adjust the alignment of the heel bone within a range that does not affect the volume of the heel part of the shoe.

[0018] Preferably, the front trimming line forming the tip portion of the main body portion does not extend over the first middle metatarsal bone of the foot during use.

[0019] If the insole is shaped to support up to the toe portion of the foot, it is conceivable that the space in the toe portion of the shoe becomes narrow and the toes hit the shoe. In this regard, according to such a configuration of the present invention, the front trimming line forming the tip portion of the main body portion does not extend over the first middle metatarsal bone of the foot during use, so that the space inside the shoe from the most forceful thumb to the first middle metatarsal bone is secured, and it can be made not to become tight even when put into highly designed shoes such as dress shoes and pumps.

[0020] Preferably, the front trimming line forming the tip portion of the main body portion does not extend over the first, second, third, fourth, and fifth middle metatarsal bones of the foot during use.

[0021] According to such a configuration, the front trimming line forming the tip portion of the main body portion does not extend over the first, second, third, fourth, and fifth middle metatarsal bones of the foot during use, so that the space inside the shoe is secured over the entire toes, and it can be made not to become even tighter when put into highly designed shoes such as dress shoes and pumps.

Effect of the Invention

[0022] It is possible to provide an insole that supports the longitudinal arch (arch) on the inner side of the foot, does not become tight even when put into highly designed shoes such as dress shoes and pumps, and does not shift in position or fall over during use.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0024] Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the drawings of the insole 10 show an example of the configuration, and since it is symmetric about the left and right and has the same configuration, the right insole 10 will be described representatively.

Example

[0025] The arch of the foot will be described. Note that the right foot is shown representatively among the left and right feet. As shown in FIG. 4, three arches are formed in a human foot 60: an outer longitudinal arch 64, an inner longitudinal arch 65, and a transverse arch 66 connecting the bases of five fingers. The inner longitudinal arch 65 is an arch connecting the heel 63 and the base of the thumb, and is an arch of the part constituting the instep 61. The outer longitudinal arch 64 is an arch connecting the heel 63 and the base of the little finger, and spreads outward when weight is applied to support the weight.

[0026] The outer longitudinal arch 64 is a lower arch compared to the inner longitudinal arch 65. By raising and lowering these three arches, it is possible to smoothly absorb the impact during walking and perform a smooth kicking motion. Also, when wearing highly designed shoes 70 such as dress shoes or pumps (see Fig. 7), the instep 62 is partially pressed, and the inside of the shoes 70 becomes narrow and lacks room.

[0027] Among the bone parts of the foot 60, the middle metatarsal bone 67 is composed of the first middle metatarsal bone 67a on the thumb side, the second middle metatarsal bone 67b on the index finger side, the third middle metatarsal bone 67c on the middle finger side, the fourth middle metatarsal bone 67d on the ring finger side, and the fifth middle metatarsal bone 67e on the little finger side. Since the middle metatarsal bone 67 has a bulge, by ensuring that the area near the middle metatarsal bone 67 does not become too narrow when wearing narrow shoes 70, it is possible to avoid feeling tight when wearing the shoes 70.

[0028] Next, the insole 10 will be described. As shown in Figs. 1 to 3(A), Fig. 5, Fig. 6(A), and Fig. 7, the insole 10 is placed in the shoes 70 to support the arch 61 of the foot 60 and form an arch (the inner longitudinal arch 65).

[0029] The insole 10 has flexibility and includes a main body part 20 that is disposed inside from the central part in the width direction of the foot 60 on the sole 71 of the shoes 70 during use, an inner longitudinal arch support part 21 that is curved (bulging upward) on the main body part 20 and supports the arch 61 during use to form the inner longitudinal arch 65 of the foot 60, an arch inversion prevention part 22 that protrudes outward from the rear of the inner longitudinal arch support part 21 on the main body part 20 and is stepped on by the heel 63 of the foot 60 during use to prevent the inversion of the inner longitudinal arch support part 21, and a heel cutout part 23 that is formed by cutting out from the outer rear part of the inner longitudinal arch support part 21 to the front central part of the arch inversion prevention part 22.

[0030] In this way, due to the main body part 20, the inner longitudinal arch support part 21, the arch inversion prevention part 22, and the heel cutout part 23, the insole 10 is formed in a J shape in plan view.

[0031] Further, the insole 10 is composed of a surface portion 20a that constitutes the surface and a back surface portion 20b that constitutes the back surface, and can be divided into a material suitable for contacting the foot 60 and a material suitable for contacting the sole 71 of the shoe 70. The back surface portion 20b is provided with a back surface cutout portion 23b formed by cutting out further rearward than the heel cutout portion 23 formed in the surface portion 20a.

[0032] Thereby, with the two-stage configuration of the heel cutout portion 23 without a member and the back surface cutout portion 23b where the surface portion 20a is further formed, the arch inversion prevention portion 22 can be formed so that the thickness gradually increases from the edge of the heel cutout portion 23, and the heel 63 can be brought into contact with the insole 10 without a sense of discomfort.

[0033] Further, an edge portion 22a curved in a cup shape is formed at the edge of the arch inversion prevention portion 22. Thereby, the holding property of the heel 63 can be improved.

[0034] Next, the front trimming line 24 of the insole 10 will be described. In the insole 10, the front trimming line (distal end) 24 that forms the tip portion of the main body portion 20 is formed so as not to cover the first midfoot bone 67a of the foot 60 during use.

[0035] Furthermore, in the insole 10, the front trimming line 24 that forms the tip portion of the main body portion 20 is formed so as not to cover the first midfoot bone 67a, the second midfoot bone 67b, the third midfoot bone 67c, the fourth midfoot bone 67d, and the fifth midfoot bone 67e of the foot 60 during use.

[0036] As described above, since the midfoot bone 67 has a bulge, it is important to secure a space near the midfoot bone 67 when wearing a narrow shoe 70 so as not to feel tight. In this regard, in the present invention, since the front trimming line 24 of the insole 10 does not cover the midfoot bone 67, the space around the midfoot bone 67 is not narrowed, and even when the insole 10 of the present invention is inserted into the shoe 70, it can be made not to feel tight.

[0037] Next, the outer trimming line 25 and the outer longitudinal arch space 26 of the insole 10 will be described. In the insole 10, the outer trimming line 25 that forms the outer side of the main body 20 is formed to be inside the outer longitudinal arch 64. Further, in the main body 20 of the insole 10, an outer longitudinal arch space 26 is formed outside the inner longitudinal arch support portion 21 and without a portion that supports the outer longitudinal arch 64 of the foot 60.

[0038] Accordingly, while giving priority to maintaining the function of the inner longitudinal arch 65 without providing a portion that supports the outer longitudinal arch 64, the insole 10 can be made as compact as possible so that it does not become tighter even when inserted into highly designed shoes 70 such as gentlemen's shoes and pumps.

[0039] Next, the angle adjustment portion 31 will be described. As shown in FIGS. 2, 3, and 6(B), on the bottom surface of the arch fall prevention portion 26, an angle adjustment portion 31 is provided for correcting the inclination ∠α of the heel 63 within a range of 0 degrees to 30 degrees.

[0040] As shown in FIG. 3(B), the angle adjustment portion 31 can be formed into the shape of the angle adjustment portion 31 indicated by the solid line with an angle by cutting the shaving margin 31a from the angle adjustment portion 31 having a thickness indicated by the imaginary line.

[0041] Next, the angle adjustment portion 31 according to another aspect will be described. As shown in FIG. 3(C), the angle adjustment portion 31 can be formed into the shape of the angle adjustment portion 31 indicated by the extension line of the imaginary line by adhesively attaching the attachment pad 31b to the angle adjustment portion 31 indicated by the solid line.

[0042] Next, an example of the shoe 70 and the set of the insole 10 will be described. As shown in FIG. 5, the shoe 70 is a so-called pump, and includes a sole 71 forming the bottom of the shoe, a pump 72 forming the toe portion, an upper 73 forming the surface, a lining 74 forming the inner surface, a heel grip 75 forming the rear inner portion, and a heel supporting the heel portion.

[0043] The insole 10 is inserted into the opening of the shoe 70 as shown by the arrow, aligning the arch inversion prevention portion 22 with the rear end portion of the sole 71 inside the shoe and aligning the inner longitudinal arch support portion 21 with the inner edge portion of the sole 71 inside the shoe, whereby the insole 10 is set in the shoe 70.

[0044] Next, the action of the inner longitudinal arch support portion 21 of the insole 10 will be described. As shown in FIG. 6(A), the inner longitudinal arch support portion 21 of the insole 10 supports the instep 61 of the foot 60. Thereby, the inner longitudinal arch 65 is formed. Further, since the front trimming line (distal end) 24 does not reach the first metatarsal head 67a of the foot 60 during use, the space in the metatarsal head 67 portion does not become narrow, and the shoe 70 does not become tight even when the insole 10 is inserted.

[0045] Next, the action of the angle adjustment portion 31 of the insole 10 will be described. As shown in FIG. 6(B), the angle adjustment portion 31 of the insole 10 is set so that the surface where the heel 63 abuts is from 0 degrees to 30 degrees with respect to the surface of the heel portion 71a of the sole of the shoe 70. When the shoe 70 is worn, the heel 63 of the foot 60 tilts along the angle of the angle adjustment portion 31. Thereby, a state in which it is easy to control each foot 60 can be created, and walking can be performed suitably.

[0046] Next, the action as viewed from above the insole 10 will be described. As shown in Fig. 7, the insole 10 is set in the shoe 70 and is arranged from the sole heel part 71a to the inner middle part 71b of the sole. In plan view, the width W1 of the tip part of the insole 10 is larger than the width W2 of the middle part in the front-rear direction of the insole 10 and smaller than the width W3 of the arch inversion prevention part 22. The insole 10 has a width W1 of the tip part smaller than the width W3 of the arch inversion prevention part 22, and by forming the outer longitudinal arch space 26 of the foot 60, the longitudinal arch 65 on the inner side can be supported by the insole 10, and the shoe 70 will not become too tight even when the insole 10 is inserted. Although the width W1 of the tip part of the insole 10 is made smaller than the width W3 of the arch inversion prevention part 22, it is not limited to this. As long as the outer longitudinal arch space 26 can be secured, the width W1 of the tip part of the insole 10 may be equal to or slightly larger than the width W3 of the arch inversion prevention part 22.

[0047] Also, the insole 10 is arranged from the sole heel part 71a to the inner middle part 71b of the sole. Since the front trimming line 24 does not cross the midfoot bone 67 and is formed in a J shape in plan view, the space around the midfoot bone 67 and the space of the outer part of the foot 60 do not become narrow, and it is possible to prevent the feeling of tightness even when the insole 10 is inserted into the shoe 70.

[0048] Next, the effects of the insole 10 of the above-described embodiment will be described. In an embodiment of the present invention, the insole 10 includes an inner longitudinal arch support portion 21 that is curved and provided on the main body portion 20 to support the instep 61 during use and form an inner longitudinal arch 65 inside the foot 60, and an arch fall prevention portion 22 that is provided on the main body portion 20 to protrude outward from the rear of the inner longitudinal arch support portion 21 and is stepped on by the heel 63 of the foot 60 during use to prevent the inner longitudinal arch support portion 21 from tipping over. Therefore, the inner longitudinal arch support portion 21 supports the inner longitudinal arch 65 (instep 61) of the foot 60, and by stepping on the arch fall prevention portion 22 with the heel 63, it is possible to prevent the insole 10 from shifting in position and tipping over inside the shoe 70 during use. Further, the insole 10 has flexibility and includes a main body portion 20 that is arranged inside from the central portion in the width direction of the foot 60 on the sole 71 of the shoe 70 during use, and an inner longitudinal arch support portion 21 that is curved and provided on the main body portion 20 to support the instep and form an inner longitudinal arch 65 inside the foot 60. Thus, the insole 10 is arranged only inside from the central portion in the width direction of the foot 60 where a space is formed by the instep 61 during use, and there is nothing on the outside from the central portion in the width direction of the foot 60 where a space cannot be formed and it becomes tight during use. Therefore, even when placed in a highly designed shoe 70 such as a dress shoe or pumps, it can be made not to become tight.

[0049] Furthermore, in the insole 10, the arch fall prevention portion 22 is provided on the main body portion 20 to protrude outward from the rear of the inner longitudinal arch support portion 21 and is formed in a J shape in plan view. Therefore, only the heel 63 portion that is not pressed by the upper 73 of the shoe 70 during use is formed over the entire width direction of the foot 60, and the shoe 70 does not become tight when worn. In addition, by providing a heel cutout portion 23 formed by cutting out from the outer rear portion of the inner longitudinal arch support portion 21 to the front central portion of the arch fall prevention portion 22, a space for the most bulging portion at the bottom of the heel 63 is secured. Therefore, even when placed in a highly designed shoe 70 such as a dress shoe or pumps, it can be made even less tight. In this way, the insole 10 of the present invention is configured to be compact with the smallest possible shape, supports the inner longitudinal arch 65 (instep 61) of the foot 60, does not become tight even when placed in a highly designed shoe 70 such as a dress shoe or pumps, and can prevent the insole 10 from shifting in position and tipping over inside the shoe 70 during use.

[0050] Furthermore, since an outer longitudinal arch space 26 without a portion for supporting the outer longitudinal arch 64 of the foot 60 is formed outside the inner longitudinal arch support portion 21, the function of the inner longitudinal arch 65 can be prioritized without providing a portion for supporting the outer longitudinal arch 64, and the insole 10 can be made as compact as possible so that it does not become tighter even when inserted into highly designed shoes 70 such as dress shoes and pumps.

[0051] Furthermore, since the bottom surface of the arch inversion prevention portion 22 is provided with an angle adjustment portion 31 for correcting the inclination of the heel 63 within the range of 0 degrees to 30 degrees, the alignment of the bones of the heel 63 can be adjusted by giving an inclination to the insole 10 itself. The angle adjustment portion 31 can form an inclination in the insole 10 within the range of 0 degrees to 30 degrees according to the symptoms of each individual foot 60, and can adjust the alignment of the heel bones within a range that does not affect the volume of the heel 63 portion of the shoe 70.

[0052] Furthermore, since the front trimming line 24 forming the tip portion of the main body portion 20 does not cover the first metatarsal head 67a of the foot 60 during use, a space within the shoe 70 from the most force - applied thumb to the first metatarsal head 67a is ensured, and it can be made so that it does not become tighter even when inserted into highly designed shoes 70 such as dress shoes and pumps.

[0053] Furthermore, since the front trimming line 24 forming the tip portion of the main body portion 20 does not cover the first metatarsal head 67a, the second metatarsal head 67b, the third metatarsal head 67c, the fourth metatarsal head 67d, and the fifth metatarsal head 67e of the foot 60 during use, a space within the shoe 70 is ensured across the entire toes of the foot 60, and it can be made so that it does not become tighter even when inserted into highly designed shoes 70 such as dress shoes and pumps.

[0054] In addition, in the embodiment, the insole 10 is composed of two layers, namely a surface portion 20a and a back portion 20b, but it is not limited thereto, and it may be composed of one layer or three layers.

[0055] Also, in the embodiment, the shoe 70 is a so - called pump, but it is not limited thereto, and the shoe 70 may be a dress shoe.

[0056] That is, as long as the functions and effects of the present invention are achieved, the present invention is not limited to the embodiments.

Industrial Applicability

[0057] The technology of the present invention is suitable for an insole that is placed in a shoe to support the ball of the foot and form an arch.

Explanation of Reference Numerals

[0058] 10... Insole, 20... Main body part, 21... Inner longitudinal arch support part, 22... Arch inversion prevention part, 23... Heel cutout part, 24... Front trimming line, 25... Outer trimming line, 26... Outer longitudinal arch space, 31... Angle adjustment part, 60... Foot, 61... Ball of foot (sole of foot), 62... Toe part, 63... Heel, 64... Outer longitudinal arch, 65... Inner longitudinal arch, 66... Transverse arch, 67... Middle metatarsal bone, 67a... First middle metatarsal bone, 67b... Second middle metatarsal bone, 67c... Third middle metatarsal bone, 67d... Fourth middle metatarsal bone, 67e... Fifth middle metatarsal bone, 70... Shoe (pumps, dress shoes), 71... Sole, 73... Upper, 75... Heel grip.

Claims

1. An insole that is inserted into a shoe to support the ball of the foot and form an arch, comprising a main body portion that is flexible and disposed on the sole of the shoe during use from the central portion in the width direction of the foot inward, an inner longitudinal arch support portion that is curved and provided on the main body portion to support the ball of the foot during use and form an inner longitudinal arch on the inner side of the foot, an arch overturn prevention portion that protrudes outward from the rear of the inner longitudinal arch support portion on the main body portion and is stepped on by the heel of the foot during use to prevent the inner longitudinal arch support portion from overturning, and a heel cutout portion formed by cutting out from the outer rear portion of the inner longitudinal arch support portion to the front central portion of the arch overturn prevention portion, and being formed in a J shape in plan view.

2. The insole according to Claim 1, wherein the main body portion is characterized in that an outer longitudinal arch space without a portion for supporting the outer longitudinal arch of the foot is formed outside the inner longitudinal arch support portion.

3. The insole according to Claim 1 or Claim 2, wherein the bottom surface of the arch overturn prevention portion is provided with an angle adjustment portion for correcting the inclination of the heel within a range of 0 degrees to 30 degrees.

4. The insole according to Claim 1 or Claim 2, wherein the front trimming line forming the front end portion of the main body portion does not extend over the first metatarsal head of the foot during use.

5. The insole according to Claim 1 or Claim 2, wherein the front trimming line forming the front end portion of the main body portion does not extend over the first metatarsal head, the second metatarsal head, the third metatarsal head, the fourth metatarsal head, and the fifth metatarsal head of the foot during use.

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