Battery manufacturing method and battery

A method for manufacturing a battery includes: preparing an electrode group (2) of a winding type in which a separator and an electrode plate are laminated and wound, the electrode group (2) having a recess (70) in which the electrode plate is shorter than a second region (R2) located on an outer edge side than a first region (R1) in a first region (R1) continuous from an inner edge of one end portion in an axial direction (E); the end of the electrode plate in the second region (R2) is bent in the radial direction (B) of the electrode group (2), the bent end and the collector plate are joined, the electrode group (2) to which the collector plate is joined is inserted into the outer can (4), the collector plate and the bottom surface of the outer can (4) are made to face each other, a pressing device (72) is inserted into the center space of the electrode group (2), the collector plate is pressed against the bottom surface, and the electrode group (2) is formed. The collector plate and the outer can (4) are j