BATTERY, METHOD OF MANUFACTURING BATTERY, AND MOLDING DIE

Joining by swaging includes: preparing a molding die including a first tapered portion and a second tapered portion, the first tapered portion being inclined at a first angle, the second tapered portion being inclined at a second angle, the second angle being larger than the first angle; and increasing a diameter of a tip portion of a terminal member by causing the first tapered portion of the molding die to face the tip portion of the terminal member, moving the molding die along the central axis, inserting the molding die into a tubular portion formed at the tip portion of the terminal member, pressing a first portion of the tubular portion outward in a radial direction by the first tapered portion, and pressing the second portion of the tubular portion outward in the radial direction by the second tapered portion.