A battery disclosed herein includes a wound electrode body, a battery case having a substantially rectangular first surface, and an electrolytic solution injection hole formed on the first surface of the battery case, a sealing member for sealing the electrolytic solution injection hole, and an insulating member fixed to the first surface. The electrolytic solution injection hole is formed in a position that does not overlap with vertexes of the curved portions of the plurality of wound electrode bodies. Herein, a part of the insulating member is disposed in a valley portion surrounded by a surface linking the vertexes of the adjacent wound electrode bodies and the curved surface of the curved portion of the adjacent wound electrode bodies, and a part of the sealing member is disposed in the valley portion.