To make it possible to assure the tight adhesion of leg hole parts and to simplify production equipment as well.

Elastic yarn 9 (A) for fitting to a body to be attached to the lower portions of an anterior belly part 5A and a back part 5B is additively added to a crotch part 5c as well in place of elastic yarn for legs without attaching the elastic yarn for the legs along the leg hole parts 5D. The flat portions of the leg hole parts 5D are eventually tightly adhered to the skin side of a wearing person over the entire part by the inward shrinkage force in the transverse direction of the elastic yarn 9 (B) for fitting to the body additively added to the crotch part 5C.