To provide a lead acid storage battery which is improved in current collection performance by increasing a portion where an ear portion and a strap are surely welded at the connection part of the ear portion and the strap of an electrode plate.

The top end faces 11a1, 12a1 extending in straight line along the width direction of both electrode plates are formed in the center part in width direction of the top end of ear portions 11a, 12a of a negative electrode plate and a positive electrode plate to constitute the electrode plate group, and the top end of the ear portions is cut so that the both-end corner parts in width direction of the top end of the both electrode plates may present a chamfered profile. The negative electrode strap 16 and the positive electrode strap 17 are cast so that the top end faces 11a1, 12a1 and the chamfered portions 11a2, 12a2 of the ear portions of the both electrode plates may be completely embedded in the straps.