An energy storage apparatus includes an energy storage device, a spacer disposed adjacent to the energy storage device, and an outer case which accommodates the energy storage device and the spacer. The spacer includes a projecting portion which projects from a bottom surface of the energy storage device. An inner surface of the outer case which faces a bottom surface of the energy storage device is provided with an accommodating portion which accommodates the projecting portion, and a placement surface portion which is disposed adjacent to the accommodating portion in an arrangement direction of the spacer and the energy storage device and on which the bottom surface of the energy storage device is placed.