A shoe sole comprising: an outsole having a tread surface to be in contact with a road surface; and a midsole arranged on the outsole, the shoe sole supporting a foot in a front foot section, an arch section, and a rear foot section, wherein: in a central section and a lateral side section of a rear foot section of the shoe sole, a diagonal groove is formed extending in a diagonal front-rear direction in the rear foot section to an outer edge of a lateral side of the rear foot section; an angle (β), formed by a virtual center line (Lc) of the diagonal groove and a longitudinal axis connecting between a center of a heel and a middle point between a big-toe ball (O1 and a little-toe ball, is set in a range of 12° to 35°; and a virtual intersection point between the longitudinal axis and the center line (Lc) is set within a range of 21% to 43% of a full length of the longitudinal axis of the shoe sole from a posterior end of the shoe sole, the diagonal groove extending to a point anterior and medial to the intersection point; the outsole is divided into pieces arranged in the front foot section and in the rear foot section, thereby leaving uncovered the arch section, and characterized in that the outsole is formed in the rear foot section in a U shape, with a central section (Rc) cut out between a medial side and a lateral side of the foot; the midsole is exposed in the arch section and the central section (Rc) of the rear foot section; the diagonal groove is formed in the midsole in the central section (Rc) of the rear foot section and in the outsole in a lateral side section of the rear foot section, the diagonal groove extending in a diagonal front-rear direction in the rear foot section to an outer edge of the lateral side of the rear foot section. in a central section and a lateral side section of a rear foot section of the shoe sole, a diagonal groove is formed extending in a diagonal front-rear direction in the rear foot section to an outer edge of a lateral side of the rear foot section; an angle (β), formed by a virtual center line (Lc) of the diagonal groove and a longitudinal axis connecting between a center of a heel and a middle point between a big-toe ball (O1 and a little-toe ball, is set in a range of 12° to 35°; and a virtual intersection point between the longitudinal axis and the center line (Lc) is set within a range of 21% to 43% of a full length of the longitudinal axis of the shoe sole from a posterior end of the shoe sole, the diagonal groove extending to a point anterior and medial to the intersection point; the outsole is divided into pieces arranged in the front foot section and in the rear foot section, thereby leaving uncovered the arch section, and characterized in that the outsole is formed in the rear foot section in a U shape, with a central section (Rc) cut out between a medial side and a lateral side of the foot; the midsole is exposed in the arch section and the central section (Rc) of the rear foot section; the diagonal groove is formed in the midsole in the central section (Rc) of the rear foot section and in the outsole in a lateral side section of the rear foot section, the diagonal groove extending in a diagonal front-rear direction in the rear foot section to an outer edge of the lateral side of the rear foot section.