Resin molding work is efficiently carried out in accordance with a consumption amount of resin pellets of a resin molding machine by sequentially supplying small amounts of dried resin pellets in short period of time. When changeover of a molded product is carried out, attached remaining resin pellets can be removed by simple work in a short period of time, thereby carrying out efficient changeover work. An interval of taking out dried resin pellets that are heated and dried in a decompressed state is shortened by sequentially moving a plurality of pellet containers that contain small amounts of resin pellets.