There is provided a structure of a sole which may suppress excessive bending, thereby improving the running efficiency, by reinforcing the front foot portion of a sole having a reduced weight. The disclosure is directed to a shoe sole, including a mid sole 2 for absorbing an impact of landing, an outer sole 1 placed under the mid sole 2 so as to be in contact with ground, and a reinforcement element 3 for suppressing bending of a front foot portion Ff during push-off. The reinforcement element 3 is an integral resin part formed in a loop shape, the reinforcement element 3 including a medial reinforcement portion 34 extending in a front-rear direction L along a medial side IN of the front foot portion Ff; a lateral reinforcement portion 35 extending in the front-rear direction along a lateral side of the front foot portion; a connection and reinforcement portion 37 for connecting together the medial and lateral reinforcement portions 34 and 35 and also for providing reinforcement; and aconnection portion 38 for connecting together the medial reinforcement portion 34 and the lateral reinforcement portion 35 in an area posterior to the connection and reinforcement portion 37.