A method of molding a steering wheel of the type having no core in its ring is provided. The mold is formed with a first cavity for forming the ring and a second cavity arranged therein with a slide core for forming cooling members. With the slide core being in a lower position, a polypropylene resin in molten state is injected to fill the first and second cavities. The, resin in the second cavity is cooled and set first because a volume thereof is less than that of the first cavity. After this, the slide core is moved to embed the cooling members into the first cavity so that the inset resin in the central portion of the first cavity may be cooled by the cooling members. Then, the unset resin in the first cavity has its solidification accelerated by contact with the cooling members. The steering wheel is extracted from the mold after the resin in the first cavity has been completely set.