in order to waterproof a terminal connecting portion of a sheathed wire , in which a terminal fitting and a bare conductor of the sheathed wire are connected with each other , the terminal connecting portion of the sheathed wire is placed into a molding cavity of a molding die such that a bottom face of the terminal connecting portion is closely brought into contact with one of inner faces of the molding cavity . then molten molding resin is injected into the molding cavity such that a bottom face of a solidified molding resin and the bottom face of the terminal connecting portion define an identical plane .