In a manufacturing method of a coil, a plurality of unit coil portions is placed side by side in a winding axis direction, each of the unit coil portions is formed of a plurality of unit wound portions having mutually different inner circumferential lengths, and the unit wound portion having a small inner circumferential length enters inside the unit wound portion having a large inner circumferential length. In coil winding method, a step of forming an outward wound unit coil portion formed of a plurality of unit wound portions laminated from an inner circumferential side to an outer circumferential side and forming an inward wound unit coil portion formed of a plurality of unit wound portions laminated from the outer circumferential side toward the inner circumferential side are alternately repeated. In outward wound unit coil portion, a step of forming the unit wound portion on the outer circumferential side by laminating on an outer circumferential surface of the unit wound portion on the inner circumferential side is repeated. In inward wound unit coil portion, a step of forming the unit wound portion at position spaced apart from the outward wound unit coil portion and pushing in the unit wound portion until it makes contact with a side surface of the outward wound unit coil portion is repeated.