POWER SUPPLY DEVICE, AND VEHICLE AND POWER STORAGE DEVICE EACH EQUIPPED WITH SAME

Power supply device includes: a battery stack in which a plurality of battery cells each having an electrode terminal on an upper surface of an outer covering can are stacked; and a plurality of bus bars connecting electrode terminals of adjacent battery cells to each other. Bus bar includes window opened through which a part of electrode terminal of battery cell can be visually recognized in a state of being overlapped with electrode terminal in plan view. As a result, even when bus bar is overlapped on electrode terminal, electrode terminal on the lower side can be visually recognized through window, so that the connection position and the height can be confirmed, and the reliability of connection can be enhanced.