In order to limit entry of a fuel cell stack into a passenger compartment by a simple structure, the fuel cell stack is accommodated in an accommodating compartment formed at a rear of a passenger compartment. A force receiving member is arranged forward with respect to the fuel cell stack and below the fuel cell stack so that rearward force acts on the force receiving member at the time of vehicle collision. When the rearward force acting on the force receiving member due to vehicle collision is larger than a predetermined upper limit value, the rearward force is converted into upward force, and the upward force is transmitted to a forward bottom surface of the fuel cell stack, whereby a forward end part of the fuel cell stack is lifted up with respect to a rearward end part of the fuel cell stack upon vehicle collision.