a plastic molding mold for inmold labelling including an inner surface defining a cavity and adhering a label placed prior to molding on the inner surface to an outer surface of an article to be molded simultaneously with molding . the mold having a label support portion protruded from the inner surface and having a surface slightly projected into the cavity , and an exhaust port opened in the side of the label support portion . the exhaust port is connected to an air suction device provided outside , and air stayed between an article to be molded and a label is removed as the air suction device is actuated .