A jointed assembly includes a first joining member having a face to be welded at at least an end face thereof and a second joining member having a joint receiving part to which the end face of the first joining member is joined. One of the first and second joining members includes on an outer face thereof an engaged part with which a receiving jig is engaged when the first and second joining members are welded to each other by a heat welding process. The other of the first and second joining members includes on an outer face thereof an abutting part against which a welding jig abuts. A welded part at which the first and second joining members are welded is interposed between the abutting part and the engaged part.
