To mold a handled bottle not generating cloudiness in the vicinity of its handle attaching part and having transparency and a gloss feeling.

A blow mold 1 is divided into a handle attaching part mold 2 corresponding to the vicinity of a handle fitting part, a body mold 3 other than the mold 2 and a bottom mold 4 and the respective molds are regulated to individual predetermined temps. and, after blow molding, blow pressure is held to closely bring the wall of a bottle main body into contact with the molding surfaces of the respective molds to subject the same to heat treatment to mold a handled bottle. By this constitution, since the respective parts different in shape can be subjected to the heat treatment at the respective optimum temps., the bottle generating no post-shrinkage or cloudiness can be molded.