A method of making a motor having a shaft; a pair of end plates arranged to be spaced apart from each other on the shaft; a magnet disposed between the pair of end plates; and a rotor case which surrounds the outer peripheries of the pair of end plates and the outer periphery of the magnet and is made of a synthetic resin material, wherein each of the pair of end plates includes: a flange part, one surface of which faces the magnet; and a cylinder part protruding in a direction opposite to the magnet from the flange part, and the flange part includes a tapered part having an outer diameter which decreases toward the cylinder part.