This manufacturing method of a stator winding coil makes it possible to reduce manufacturing equipment costs and to avoid damage to an insulation film covering a conductor wire. This stator winding coil comprises 2m linear portions, and (2m-1) coil end units which link the ends of two of the linear portions together, thereby linking the 2m linear portions into a single series. Each of the coil end units comprises a bulge portion, in the center of which a crank portion is formed, and a pair of arcuately formed slanted edge portions which link the linear portions and the bulge portion. The manufacturing method of the stator winding coil involves: a bulge portion forming step for forming a bulge portion in the conductor wire; a crank portion forming step for forming a crank portion in the center of the bulge portion; a slanted edge portion forming step for forming a slanted edge portion on both sides of the bulge portion of the conductor wire; a linear portion forming step for forming a linear portion in the conductor wire on the side of the slanted portion opposite of the bulge portion; and an arc forming step for forming the slanted edge portions into an arcuate shape after formation of the linear portions.
