First and second inclined faces of an inclined face extending radially inward and rearward from a rocking edge formed so as to coincide with a front edge of a saddle face of a body part of a metal element are molded by press forming a metal element material using a mold. An inclined face-corresponding part of the metal element material, which corresponds to the inclined face of the metal element, includes a first inclined face-corresponding portion inclined rearward at a first inclination angle from a rocking edge-corresponding part, and a second inclined face-corresponding portion inclined rearward at a second inclination angle, which is larger than the first inclination angle, from a radially inner end of the first inclined face-corresponding portion. The mold includes a first inclined face-molding portion inclined rearward at the first inclination angle from a rocking edge-molding portion abutting against the rocking edge-corresponding part.