A sole structure for shoes includes a midsole and a plate member made of a hard resin harder than the midsole, which is joined to a lower surface of the midsole. The plate member includes a first reinforcement portion extending rearwardly from a position corresponding to a portion in the rear of a thenar of a user along a medial side arch region and a second reinforcement portion extending rearwardly on a lateral side from the position corresponding to the portion in the rear of the thenar of the user so as to avoid a position corresponding to a portion more frontward than a center of a fifth metatarsal bone.