A reinforcement extending in the front-back direction of a vehicle and connecting a rear side member and a center pillar is provided. The reinforcement includes a gusset, an intermediate connecting member, and a pillar-side member. The gusset is connected to the rear side member, and the front end portion of the gusset is connected to the rear surface of the intermediate connecting member. The front surface of the intermediate connecting member is connected to the rear end portion of the pillar-side member. The pillar-side member is connected to the center pillar.