A rear vehicle body structure includes a rectangular frame, a box-shaped section, a spare-tire storage section, a peripheral flange, and a reinforcing member. The rectangular frame has a substantially rectangular shape in a plan view and includes left and right rear frames and front and rear cross members so as to contain a spare tire. The box-shaped section has a substantially rectangular bottom so as to be placed in the rectangular frame. The spare-tire storage section is provided in the box-shaped section and has an opening at an upper part of the box-shaped section to receive the spare tire. The peripheral flange projects outward from the upper part so as to be attached to the rectangular frame. The reinforcing member extends along the bottom in a front-rear direction of a vehicle body and is laid between the front and rear cross members.