Patent ID: 8863407

Claim:
A shoe sole of an athletic shoe suitable for efficient running, wherein: the shoe sole has a front foot portion, a middle foot portion and a rear foot portion continuous with one another in a front-rear direction of a foot, and has a medial side, a lateral side and a central portion between the medial side and the lateral side continuous with one another in a width direction of the foot, the shoe sole comprising: a midsole having an upper surface and a lower surface and absorbing an impact of landing; and an outsole placed below the midsole, the outsole having a ground contact surface; the midsole includes a midsole body formed by a foamed resin in the front foot portion and the middle foot portion; the outsole is separately provided in the front foot portion and the rear foot portion without being provided in the middle foot portion; the middle foot portion supports an arch of the foot, and a reinforcement member is provided in the middle foot portion for suppressing lowering of the arch; the rear foot portion has a depression extending forward from a part covering a calcaneal bone of the foot from below and extending upward relative to the ground contact surface so as not to touch a ground; the middle foot portion has a band-like area extending in the front-rear direction in the central portion so as to be continuous with the depression, the band-like area arranged above the ground contact surface so as not to touch the ground; a hardness of the reinforcement member is greater than a hardness of the midsole body, the reinforcement member is attached to the midsole body in the medial side of the middle foot portion, and the band-like area has a non-attached part that the reinforcement member is unattached to the midsole body in; the reinforcement member and the midsole are provided in the middle foot portion so that the upper surface of the midsole on the medial side is more resistant to sinking downward due to a load from above than the upper surface of the midsole in the non-attached part in the band-like area; in the front foot portion, the outsole has a longitudinal groove extending in the front-rear direction in the central portion so as to be continuous with the band-like area; a depth of the longitudinal groove is 5 mm to 20 mm; the longitudinal groove is provided to extend from a rear end of the front foot portion to a part covering a proximal interphalangeal joint of a second toe of the foot from below; the longitudinal groove is curved so as to be generally parallel to a lateral edge of the front foot portion of the midsole and terminate on the medial side of the front foot portion; a width and the depth of the longitudinal groove are smaller than those of the depression; and the depression, the band-like area and the longitudinal groove are continuous with one another in the front-rear direction.