By continuously pulling out the material while forcibly cooling the molten metal with a mold, it is possible to manufacture a casting with a finer metal structure and better quality than a sand casting product, and it is possible to reduce the machining allowance and cost. In horizontal continuous casting, not only round and pipe shapes but also hexagonal, octagonal and other irregular shape castings are possible as materials for machining and forgings, and are used as processing materials for various products such as bearing cages and faucet fittings. In vertical semi-continuous casting, a billet for hot extrusion is cast, and it is mainly used as a processing material for automobiles and hydraulic construction machines after undergoing a deformation processing.