Power supply device, vehicle having power supply device, and power storage device

A power supply device comprising:

• a battery stack constituted by stacking a plurality of secondary battery cells;
• a pair of end plates disposed on both ends in a stacking direction of the battery stack;
• and
• a plurality of fastening members fastening the pair of end plates together, wherein each of the plurality of fastening members includes:
• a fastening main face having a flat plate shape;
• and
• a locking block fixed to a corner of the fastening main face,
• each of the pair of end plates includes:
• a step that locks the locking block while being fastened by a corresponding one of the plurality of fastening members;
• and
• an end plate screw hole opened near the step,
• each of the plurality of fastening members includes:
• a fastening side through hole opened to align with the end plate screw hole, while the fastening member has a corresponding one of the pair of end plates fastened;
• and
• a fixing region at which the locking block is fixed to the fastening main face, the fixing region being disposed in a direction further away from the corresponding one of the pair of end plates than the fastening side through hole is.