To ensure an easy and highly accurate connection of a face body to a recessed part of a head body.

A face body 1 and a head body 2 having a face body 1 fitting recessed part 3 on the side of the face surface 4 are separately formed. The outer circumferential edge 11 side of the head body 2 is bent to the rearward of the face body 1 with respect to the final shape. The face body 1 is then inserted into the recess part 3 of the head body 2. The head body 2 is thereafter pressed and deformed into the final shape for fitting the face body 1 into the recess part 3.