JP2021186282A - Inner sole or footwear - Google Patents

Abstract

To provide an inner sole or a piece of footwear for the purpose of promoting kicking with the specific part near a big toe and of improving a kicking force.SOLUTION: In an inner side part D in the region of a forefoot part A, there is provided an inner side forefoot protrusion part group 40 which is arranged in a manner protruding upward from the upper face 31b or downward from the lower face 31d of an inner sole 30 and in a manner wrapping the outer periphery of a big toe in plane view. Also, the inner side forefoot protrusion part group 40 is composed by any one or more than two combinations of: a first protrusion part which is arranged near the proximal phalanx between the big toe and the second toe of a foot; a second protrusion part which extends in a toe direction from the first protrusion part; a third protrusion part which extends in a big toe direction in a manner traversing the big toe proximal phalanx from the first protrusion part; a fourth protrusion part which is arranged along near the rear side edge of a thenar; and a fifth protrusion part which is arranged along an inner edge curvature of the inner sole from near the rear side edge of the thenar.SELECTED DRAWING: Figure 3

Description

The present invention relates to footwear having an inner sole or a midsole that is worn as an insole for shoes.

Conventionally, as an inner sole (also referred to as a sole plate or a corrective insole) to be attached to the inside of a shoe, a sole having a special height in the center of the arch portion of the foot is well known. For example, in the technique of Patent Document 1, by providing a convex portion that supports the cuboid bone (arch portion) from the sole of the foot, the anterior portion of the calcaneus is supported, and the entire tarsal bone including the calcaneus is stable in a natural state. I try to do it.

Japanese Patent No. 5498631

Many conventional inner soles focus only on vaguely supporting the arch of the sole of the foot. However, by adjusting the thickness of this arch shape in millimeters, or by installing a specific shape on the toes and adjusting the usage of the toes, the kicking direction, and the kicking force, the body center of gravity movement. There is no inner sole shape that specializes in intentionally controlling.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an inner sole for promoting kicking at a specific part near the hallux or improving kicking force. be.

In order to solve the above-mentioned problems, the present invention is an inner sole used as an insole for shoes, and the upper surface of the inner sole is divided into three regions of a forefoot, a midfoot, and a hindfoot. A group of medial forefoot protrusions are provided on the medial side of the forefoot region so as to project from the upper surface to the upper side or from the lower surface to the lower side of the inner sole and wrap around the outer circumference of the hallux in a plan view. It is characterized by.

Further, the medial forefoot convex portion group includes a first convex portion arranged near the proximal phalanx between the mother toe and the two toes of the foot, and a second convex portion extending from the first convex portion in the toe direction. A third convex portion extending in the direction of the hallux so as to cross the proximal phalanx of the hallux from the first convex portion, a fourth convex portion arranged along the vicinity of the posterior margin of the ball of the hallux, and the hallux. It is composed of any one or a combination of two or more with a fifth convex portion arranged along the curve of the inner edge of the inner sole from the vicinity of the rear edge of the ball.

On the other hand, the footwear according to the present invention is characterized in that the medial forefoot convex portion group according to claim 1 or 2 is provided as a midsole.

In the inner sole and footwear according to the present invention, the upper surface of the inner sole is divided into three regions of forefoot, midfoot, and hindfoot, and the inner part of the forefoot region is located above the upper surface of the inner sole. Alternatively, by providing a group of medial forefoot protrusions that protrude downward from the lower surface and wrap around the outer circumference of the hallux in a plan view, it is possible to encourage kicking at a specific part near the hallux. The kicking power can be improved.

It is a schematic diagram explaining a body center of gravity and a floor reaction force. It is a schematic diagram which shows the movement locus of a COP and a body center of gravity. It is a single unit view of the inner sole which concerns on embodiment of this invention, (A) is a plan view, (B) is a right side view of (A). It is an enlarged view of the X part of FIG. It is a plan view of a human foot bone. It is a schematic diagram which shows the positional relationship between a person's foot bone and the 1st to 5th convex portions in a plan view. It is a graph which shows the relationship between the muscle length and tension.

All the movements that a person performs on a daily basis are movements that control the center of gravity 26 of the body. COP (Center of Pressure) is important in terms of biomechanics in order to control the body center of gravity 26. First, this COP will be briefly described. In addition, in FIG. 1, for the purpose of facilitating the visual understanding of the relationship between the center of gravity of the body and the COP in a human standing position, a simulated body such as a robot with the upper body removed is placed on an object having a shape close to a semi-elliptical shape. Indicates a stationary state.

As shown in FIG. 1, the force W1 acting in the direction of gravity from the human body center of gravity 26 is transmitted to the foot 25 via the simulated hip joint 22, the simulated knee joint 23, and the simulated ankle joint 24, and is transmitted from the foot 25 to the sole of the foot. Acts on the floor through the object of. On the other hand, a reaction force (hereinafter referred to as a floor reaction force W2) received from the floor via an object on the sole of the foot is generated on the entire sole of the foot 25.

The COP is widely used in scientific calculations as the starting point of the combined vector (floor reaction force W2) of the force acting on the entire contact surface between the sole of the foot and the object. Then, the movement of each joint of the whole body including the movement of the center of gravity of the body is physically determined by the magnitude and direction of the floor reaction force W2 generated from this COP. The ideal COP movement locus during walking is indicated by a line Y drawn on the foot LF and LR in FIG. By optimizing the COP movement locus Y, which differs between individuals, it is possible not only to improve walking style and pain, but also to improve sports performance.

In addition, most COPs of sports and daily movements occur from the heel of the foot or the vicinity of the heel (hereinafter, COP starting point), and the end (COP ending point) is often the toe part. For example, in normal walking, it can be said that it is ideal that the ground is touched from the heel and the part between the mother toe and the two toes is the COP end point. In addition, it can be said that it is ideal that the medial part of the hallux is the end point of the COP in the foot (usually the right foot) distal to the Darget during the golf swing. In this way, the strength and direction of kicking is determined by which toe the end point of the COP is near, or which specific part of the toe, and the force generated by this determines the direction and speed of the center of gravity of the body. And the movement of the body is formed.

Anatomically and kinematically, it is most efficient that the end point of COP is near the hallux. The reason is that the hallux metatarsophalangeal bone 18a, hallux proximal phalanx 19a, and hallux distal phalanx 20a are larger than those of other fingers, and unlike other fingers, the arrangement of muscles that function independently of the hallux. Have, etc. In addition, setting an inappropriate site as the COP end point not only causes deterioration of sports performance, but also causes disability and pain in all movements including walking.

In addition, in a person who walks on two legs, the difference in kicking force between the left and right feet caused by the position of the COP end point or the difference in the movement speed of the COP causes twisting to the entire lower limbs, pelvis, and trunk. It has an impact and is also becoming a social problem, leading to various disorders such as pain.

The present invention improves the kicking force at a specific site near the hallux by guiding the COP end point to a specific site near the hallux, or increases or decreases the kicking force at the left and right feet. This makes it possible to create a movement that is more suitable for the purpose, and it can be said that the new point is to install the convex part mainly around the forefoot part (near the finger).

3A and 3B are inner soles 30 according to an embodiment of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a right side view of FIG. 3A. Further, FIG. 4 is an enlarged view of a portion X in FIG. 3 (A). Further, FIG. 5 is a plan view of the metatarsal bone, and FIG. 6 is a schematic view showing the positional relationship between the human foot bone and the first to fifth convex portions in a plan view.

The inner sole 30 shown in FIG. 3 is for the right foot, and the one for the left foot has a symmetrical configuration. Therefore, in the following description, the inner sole 30 for the right foot will be described, and the description for the left foot will be omitted. If a strict comparison is made, the shape of the left foot and the right foot will be asymmetrical depending on the user (because it is necessary to correct the movement trajectory of COP caused by the variation of the left and right soles). Assuming that it is within the range of individual differences, we will proceed with the explanation assuming that it is symmetrical.
Further, the inner sole referred to in the present invention is not only used by the user separately attached to the finished shoe, but also a removable inner sole provided in advance at the manufacturing stage and sewn on the shoe. Inner sole is also included.

As shown in FIG. 3A, the inner sole 30 is formed in a shape close to the outer shape (insole shape) that matches the inside of the shoe, and has six regions according to the region lines L1, L2, and L3 when viewed from above. It is divided into. The division of the region lines L1, L2, L3 and the regions A to E is determined based on the structure of the human footbone 1 as shown in FIG.

The human footbone 1 can be divided into three regions A, B, and C in the anterior-posterior direction. Specifically, the forefoot part A (1st to 5th metatarsal bones 18 and 1st to 5th toe bones 19 (1st to 5th are the 1st (mother toe), 2nd (toe), respectively). It refers to the 3rd (middle toe), 4th (ring toe), and 5th (small toe). Position), metatarsal bone B (composed of wedge-shaped bones 11, 12, 13, cubic bone 14, boat-shaped bone 15: between Chopard joint and Lisfranc joint), and hindfoot part C (healan bone 17, It is composed of the phalange 16 (proximal to the Chopard joint). The area lines L1 and L2 are lines that roughly divide these areas A, B, and C.

Further, one region line L3 is drawn substantially perpendicular to the paper surface of FIG. 5 connecting the apex of the second toe to the most protruding portion of the calcaneus, and two regions (inner portion D and outer portion E) are drawn on the left and right sides of the region line L3. ) Is divided.
The positions of the area lines L1 to L3 shown in FIG. 5 correspond to the positions of the area lines L1 to L3 shown in FIG. 3 (A).

The inner sole 30 is molded according to the internal shape of the shoe and is composed of a sole having a certain thickness and a group of convex portions 40 on the inner forefoot that protrude upward from the upper surface 31b of the sole 31. There is. Further, as shown in FIG. 4, the medial forefoot convex portion group 40 has five convex portions (first convex portion 41,) in the region of the forefoot portion A and the medial portion D partitioned by the region lines L1 and L3. It is composed of a second convex portion 42, a third convex portion 43, a fourth convex portion 44, and a fifth convex portion 45).

Each of the convex portions 41, 42, 43, 44, 45 of the convex portion group 40 is integrally formed with the bottom floor 31, and the bottom floor 31 can be carved out to give a desired shape or height dimension. I'm adjusting. Further, the convex portions 41, 42, 43, 44, 45 may not be integrally formed with the bottom laying 31, for example, each convex portion formed separately from the bottom laying 31 having a flat upper surface 31b. The convex portion group 40 can also be formed by pasting 41 to 45.

As shown in FIG. 6, these first to fifth convex portions 41, 42, 43, 44, 45 are arranged so as to wrap around the outer periphery of the hallux in a plan view. Each of these convex portions 41, 42, 43, 44, 45 has a unique function and effect depending on its position and shape.

As shown in FIGS. 3 and 4, the first convex portion 41 is located near the proximal phalanx 19a between the toes and the toes of the foot (between the fingers and near the base of the fingers). The shape of the first convex portion 41 has one side extending back and forth along the second toe, and is formed into a substantially triangular shape having an apex inside the one side. The dimensions of the first convex portion 41 are 5 mm to 30 mm in the lateral direction (inner and outer directions) of FIG. 4, 5 mm to 40 mm in the front-rear direction, and the T1 dimension in the height direction (thickness direction. FIG. 3B). ) Has a convex portion of 1 mm to 7 mm.

The first convex portion 41 may have, for example, a quadrangular shape or an elliptical shape instead of the substantially triangular shape described above, and has a shape near the proximal phalanx 19a portion between the user's hallux and two toes. It can be changed as appropriate according to.

The second convex portion 42 has a base portion near the front side of the first convex portion 41 and extends in the toe direction. The dimensions of the second convex portion 42 are 2 mm to 10 mm in the lateral direction (inner and outer directions) of FIG. 4, 5 mm in the front-rear direction to the tip of the sole toe, and 1 mm to 7 mm in the height direction T1. ing.

The shape of the second convex portion 42 is arbitrary, and is composed of a long shape such as a rectangular shape or an elliptical shape. Further, the base portion of the second convex portion 42 does not necessarily have to be in contact with (continuously) with the first convex portion 41, and may be configured with a gap.

The third convex portion 43 has a base near the inside of the first convex portion, and extends in the medial direction (direction of the hallux) so as to cross the proximal phalanx 19a of the hallux. The dimension of the third convex portion 43 is 2 mm to 10 mm in the front-rear direction from 5 mm in the lateral direction (inner-outer direction) in FIG. 4, and 1 mm to 7 mm in the height direction T1. There is.

The shape of the third convex portion 43 is also arbitrary as in the case of the second convex portion 42, and is composed of a long shape such as a rectangular shape or an elliptical shape. Further, the base of the third convex portion 43 does not necessarily have to be in contact with (continuously) with the first convex portion 41, the fifth convex portion 45 described later, and the inner edge of the sole, and may be configured with a gap. good.

The fourth convex portion 44 is formed in a substantially V-shape along the vicinity of the posterior margin of the ball of the hallux (near the proximal margin 18a of the head of the hallux of the hallux). The fourth convex portion 44 is arranged so that the heel side end has the maximum length and extends to the center of the medial cuneiform bone. Further, it is a convex portion of 1 mm to 10 mm in the height direction T1.

The V-shape of the fourth convex portion 44 is also arbitrary, and may be formed in, for example, a substantially U-shape or a shape close thereto. Further, the fourth convex portion 44 does not necessarily have to be in contact with (continuously) the first convex portion 41 described above and the fifth convex portion 45 described later, and may be configured with a gap.

The fifth convex portion 45 is arranged from the vicinity of the posterior lateral edge of the ball of the hallux or from the vicinity of the medial side of the hallux bone along the curvature of the medial edge 31c of the sole. The dimensions of the fifth convex portion 45 are 2 mm to 15 mm in the lateral direction (inner and outer directions) of FIG. 4, from 15 mm in the front-rear direction to the tip of the sole toe at the maximum, and a convex portion of 1 mm to 7 mm in the height direction T1. It has become.

The shape of the fifth convex portion 45 is also arbitrary based on the shape of the user's foot, and for example, it does not need to be in contact with the inner edge of the sole along the curve, and is configured with a gap from the inner edge of the sole. There may be. Further, it is not always necessary to be in contact with (continuously) with the fourth convex portion 44.

The first to fifth convex portions 41, 42, 43, 44, 45 have only one of these convex portions 41, 42, 43, 44, 45 according to the condition of the user's foot bone. It can be provided alone or in combination of two (or three, four, five).

By increasing the number of combinations, it is possible to increase the kicking force at a specific part near the hallux. That is, by changing the number of combinations and the combination pattern, it is possible to change the degree of kicking force at a specific part near the hallux or the degree of induction of COP near the hallux. It is possible to derive the optimum operation according to the above. Therefore, the first to fifth convex portions 41, 42, 43, 44, and 45 may be used alone or in combination.

The first to fifth convex portions 41, 42, 43, 44, 45 may be used in addition to the existing inner sole shape that supports the arch shape of the sole, or the first to fifth convex portions 41, 42, 43. , 44, 45 in some cases. The existing inner sole shape referred to here refers to an object having a shape that supports the structure of the sole of the foot for various purposes other than the planar shape. Further, the heights of the first to fifth convex portions 41, 42, 43, 44, and 45 when added to the existing inner sole shape are the surfaces (upper surface 31b) of the existing inner sole shape immediately below where these convex portions are installed. The height of the existing inner sole-shaped surface configured on a flat surface) is set to zero (origin), and is defined as the thickest points of the first to fifth convex portions 41, 42, 43, 44, 45.

When the first to fifth convex portions 41, 42, 43, 44, and 45 are composed of only the convex portions, the height of the surface (upper surface 31b) directly below the convex portions is set to zero (starting point). , The thickest points of the first to fifth convex portions 41, 42, 43, 44, 45 are defined.
Further, even when the existing inner sole shape and the first to fifth convex portions 41, 42, 43, 44, 45 are machined together, the surface directly below the convex portion (on the upper surface 31b plane). The height of the configured inner sole-shaped surface (the surface of the existing inner sole shape assuming that the convex portion of the medial forefoot is not configured) is set to zero (starting point), and the first to fifth convex portions 41, 42, 43, 44, 45 It is defined as up to the thickest point.

The first to fifth convex portions 41, 42, 43, 44, 45 can be used in combination as necessary, in consideration of user characteristics, a combination method, a length in the lateral direction (inner / outer direction), and a front-rear direction. The length, length in the height direction, width, etc. are determined within the above numerical range. These numerical ranges are derived from the results of experimental use of the patented technology in advance for 2500 or more users.

According to the inner sole 30 according to the embodiment of the present invention, the upper surface 31b of the inner sole 30 is divided into three regions of the forefoot portion A, the midfoot portion B, and the hindfoot portion C, and the region of the forefoot portion A is divided. Since the medial portion D is provided with the medial forefoot convex portion group 40 which protrudes upward from the upper surface 31b of the inner sole 30 or downward from the lower surface 31d and is arranged so as to wrap the outer periphery of the hallux in a plan view. , It is possible to encourage kicking near the toes when moving the center of gravity during walking or sports, and to improve the kicking power.

Further, the medial forefoot convex portion group 40 includes a first convex portion 41 arranged near the proximal phalanx 19a between the hallux and the two toes of the foot, and a second convex portion extending from the first convex portion 41 in the toe direction. By providing either the convex portion 42 and the third convex portion 43 extending in the direction of the hallux so as to cross the proximal phalanx 19a of the hallux from the first convex portion 41, such a first convex portion 41, The second convex portion 42 and the third convex portion 43 can easily recognize between the hallux and the two fingers by a principle similar to the raising of finger awareness by the foot bag or the thong of the sandals. A brain-scientific consideration of this principle is that when a change in partial pressure occurs in the sole of the foot, especially near the fingers where the protrusions are rarely felt inside the shoe, the sensory receptors on the sole of the foot are excited. Recognize the existence of the first to third convex portions 41, 42, 43. The perceived sensations are processed in the cerebrum and ultimately the sensitivity to the sensations by these protrusions 41, 42, 43 is increased. In addition, the sensitivity of the sensory receptors on the soles of the feet is further amplified by the predictive response by the region of the cerebrum that remembers and understands the effects of these protrusions 41, 42, 43. It is considered that these biological reactions can induce the movement of stepping on the protrusions 41, 42, and 43.

Further, if the pressure from the first to third convex portions 41, 42, 43 continues for a long time, conversely, the recognition of the convex portions 41, 42, 43 deteriorates as they become accustomed to it. However, even when the recognition is lowered, the sensory information is always sent to the brain (the information is transmitted to the brain through a spinal cord pathway different from the case of recognizing the protrusions 41, 42, 43). ). This information is processed mainly in the cerebellum, and can be expected to have the effect of promoting learning of exercise quality, efficiency, and accuracy.

Further, the medial forefoot convex portion group 40 includes a fourth convex portion 44 arranged along the vicinity of the posterior margin of the ball of the toe, so that such a fourth convex portion 44 is the posterior margin of the ball of the toe. It stabilizes the body, assists the efficient stepping by the hallux, and gives structural stability. In addition, the muscles (flexor hallucis longus, abductor hallucis longus, and adductor hallucis longus) that are present on the sole of the foot due to the compression by the fourth convex portion 44 and create stepping by the hallux (afferent plantar flexion and efferent plantar flexion). The contractile force can be improved by increasing the muscle length (tensioning) of the rolling muscle and the flexor hallucis longus. This can be explained from the graph of the relationship between muscle length and tension shown in FIG. Overall muscle tension is higher when the muscles are taut than when they are loose. By applying these physiological characteristics, the fourth convex part 44 installed on the sole of the foot makes it possible to kick out near the toes more powerfully, or to draw out the potential and promote the natural exertion of power. Become.

Further, the medial forefoot convex group 40 includes a fifth convex portion 45 arranged along the curvature of the medial edge 31c of the inner sole from the vicinity of the posterior lateral edge of the ball of the hallux or the medial side of the hallux bone. Then, such a fifth convex portion 45 acts to stabilize the inner edge of the hallux and promote kicking in the vicinity of the hallux. The entire hallux has a round structure, and the entire bottom of the toe does not touch the ground inside the shoe. Therefore, by installing the fifth convex portion 45 on the inner side of the hallux, the ground contact area of the hallux expands inward to help kicking. This convex portion is effective not only for kicking in the direction of the toes, but also for the action of stepping on the inner part of the hallux, such as the competitive characteristics of golf.

In addition, by combining these first to fifth convex portions 41, 42, 43, 44, 45, it is possible to induce kicking forward or inward from a specific part near the hallux, or the vicinity of the hallux itself. It becomes possible to stabilize the structure of. Since most sports and activities of daily living include elements that move the center of gravity of the body forward and inward, it can be said that this is a new technology that can be applied in various fields.

Although the inner sole 30 according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. be.

For example, in the present embodiment, the first to fifth convex portions 41, 42, 43, 44, 45 are projected upward from the upper surface 31b of the bottom floor 31, but the lower surface 31d of the bottom floor 31 (FIG. 3 (FIG. 3). It may be projected downward from the surface on the back side of the paper surface in A), which is a base point that defines the height of each convex portion when the surface is projected downward. That is, the functions of the first to fifth convex portions 41, 42, 43, 44, 45 improve the perception and sensation in the vicinity of the hallux, and also obtain the stability of the bone and the increase in muscle tension in the vicinity of the hallux. Any configuration may be used.

Further, in the present embodiment, the inner sole 30 to be mounted as the insole of the shoe has been described, but the inner sole convex portion group 40 (the first to fifth convex portions) to be integrally provided with the footwear as the mid sole is provided. 41, 42, 43, 44, 45) can also be provided. Here, the midsole refers to a member in which the sole of the foot directly contacts the footwear without going through the inner sole 30, such as a portion of the sandal that comes into contact with the sole of the foot. Even in the case of footwear having a midsole having such a medial forefoot convex group 40, the same mechanism as in the case of the inner sole due to the medial forefoot convex group 40 is performed in the same manner as the inner sole 30 described above. It is possible to encourage kicking at a specific part near the mother toe and improve the kicking force.

1 Foot bones 11, 12, 13 Wedge bones 14 Cubic bones 15 Boat-shaped bones 16 Far bones 17 Ankle bones 18 1st to 5th metatarsal bones 18a Mother toe metatarsal bones 19 1st to 5th toe bones 19a Mother toe base segment bones 20a Metatarsal bones 22 Simulated hip joint 23 Simulated knee joint 24 Simulated ankle joint 25 Foot 26 Body center of gravity 30 Inner sole 31 Bottom laying 31a Outer edge 31b Upper surface 31c Medial edge 31d Lower surface 40 Medial forefoot convex part group 41 First convex Part 42 2nd convex part 43 3rd convex part 44 4th convex part 45 5th convex part A Forefoot part B Metatarsal part C Hindfoot part D Inner part E Outer part L1, L2, L3 Area line LF Left foot RF Right foot T1 Height dimension W1 Load W2 Floor reaction force Y COP movement locus Z Movement locus of body center of gravity

In order to solve the above-mentioned problems, the present invention is an inner sole used as an inlay for shoes, and the upper surface of the inner sole is divided into three regions of a forefoot, a midfoot, and a hindfoot. the inner part of the region of the forefoot, upward from the upper surface of the inner sole, or protrude downward from the lower surface, the inner forefoot protrusion group arranged so as to wrap the outer circumference of the hallux in plan view is provided, wherein The medial forefoot convex group includes a first convex portion arranged near the hallux and the hallux of the foot, a second convex portion extending from the first convex portion in the toe direction, and the above-mentioned. The third convex part extending from the first convex part in the direction of the hallux so as to cross the hallux basal bone, the fourth convex part arranged along the vicinity of the posterior margin of the ball of the ball, and the posterior side of the ball of the ball. It is characterized in that it is composed of a fifth convex portion arranged along the curve of the inner edge of the inner sole from the vicinity of the edge, and any one or a combination of two or more.

On the other hand, the footwear according to the present invention is characterized in that the medial forefoot convex portion group according to claim 1 is provided as a midsole.

Claims (3)

An inner sole used as an insole for shoes
The upper surface of the inner sole is divided into three regions, a forefoot, a midfoot, and a hindfoot, and is located on the inner side of the forefoot region, from the upper surface to the upper side of the inner sole, or from the lower surface to the lower side. An inner sole characterized by having a group of convex parts of the medial forefoot that are arranged so as to wrap around the outer circumference of the hallux in a plan view. The medial forefoot convex portion group includes a first convex portion arranged near the proximal phalanx between the mother toe and the hallux of the foot, and a second convex portion extending from the first convex portion in the toe direction. A third convex portion extending from the first convex portion in the direction of the hallux so as to cross the proximal phalanx of the hallux, a fourth convex portion arranged along the vicinity of the posterior margin of the ball of the ball, and the posterior part of the ball of the ball. The first aspect of claim 1, wherein the fifth convex portion is arranged from the vicinity of the side edge along the curve of the inner edge of the inner sole, and is composed of any one or a combination of two or more. Inner sole. A footwear comprising the medial forefoot convex portion group according to claim 1 or 2 as a midsole.

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