Method of manufacturing battery and battery

A method of manufacturing a battery, comprising:

• preparing an electrode group having a winding structure in which a separator and an electrode plate are stacked and wound, the electrode group having, in a first region continuous from an inner edge at one end of the electrode group in an axial direction, a recess in which the electrode plate is shorter than in a second region located more toward an outer edge than the first region;
• bending an end of the electrode plate in the second region in a radial direction of the electrode group and joining the bent end to a current collector plate;
• inserting the electrode group joined to the current collector plate into an outer can and causing the current collector plate and a bottom surface of the outer can to face each other;
• and
• inserting a pressing tool into a central space of the electrode group and pressing the current collector plate against the bottom surface to join the current collector plate to the outer can.