A stator of an electric motor is formed by a plurality of split stators that are divided in a circumferential direction of the cylindrical stator. Each split stator comprises a yoke portion that is divided in the circumferential direction, a tooth portion that extends from the yoke portion a in a radial direction, and a coil wound on the tooth portion. The coil is pressed into the coil-housing portion, defined by the yoke portion and the tooth portion, by a press die. While the coil is pressed into the coil-housing portion by the press die, the coil may be covered by, for example, being integrated with a resin. Thus, the risk of damaging the coating of the coil is significantly reduced, the coil density is improved, and good circularity of the stator is ensured.