Shoe sole having outsole and midsole

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, wherein:

• the midsole includes a lower midsole of a lower layer formed by a foam body of a resin, and an upper midsole of an upper layer formed by a second foam body of a resin and arranged on the lower midsole;
• a lateral roll-up portion configured to support a lateral side of a foot from a side of the foot is formed integrally with the lower midsole;
• the lower midsole includes a lateral portion and a medial portion;
• the lateral portion of the lower midsole including the lateral roll-up portion has a first hardness;
• the medial portion of the lower midsole has a second hardness that is lower than the first hardness;
• a lateral portion of the upper midsole has a third hardness that is lower than the first hardness;
• and
• a part or a whole of the lateral roll-up portion is configured to protrude in an upward direction past the upper midsole on a lateral side of the upper midsole so that the lateral side of the foot is supported by the lateral roll-up portion from the side of the foot without being supported by the upper midsole from the side of the foot,
• wherein the lateral portion of the upper midsole has a hollowed out and narrowed portion in an area adapted to a metatarsophalangeal joint of a fifth toe, hollowed out and narrowed portion defined by a line that is curved so as to protrude toward a medial side;
• an outer edge line of the lateral portion of the upper midsole is curved so as to protrude toward a lateral side in an area anterior to a most narrowed portion of the hollowed out and narrowed portion,
• the outer edge line of the lateral portion of the upper midsole is curved so as to protrude toward the lateral side in an area posterior to the most narrowed portion of the hollowed out and narrowed portion;
• the lateral portion of the lower midsole forms a base portion that is configured to cover from below at least a part of the metatarsophalangeal joint of the fifth toe;
• the base portion of the lower midsole fills the hollowed out and narrowed portion;
• and
• the lateral roll-up portion of the lower midsole rolls up in the upward direction in a lateral edge of the base portion.