POWER SUPPLY DEVICE, ELECTRIC VEHICLE USING SAME, AND POWER STORAGE DEVICE

Power supply device is a power supply device to be fixed to a power supply target equipment. Power supply device includes: a plurality of battery cells each having a prismatic outer covering can; a pair of end plates that covers both side end faces of a battery stack in which the plurality of battery cells are stacked; lower plate that covers a lower face of the battery stack; a plurality of fastening members that are sheets extending in a stacking direction of the plurality of battery cells and are arranged on opposed side faces of the battery stack to fasten end plates to each other in a state where the battery stack is placed on an upper surface of lower plate; a plate fixing mechanism for fixing lower plate to the power supply target equipment; and a connecting structure for connecting lower plate and fastening member to each other in a state where the displacement between lower plate and fastening member is allowed.