Abstract: A temperature control unit for raw molding sand or resin-coated sand for a shell mold according to the present invention comprises a heat exchanger (A) consisting of a spiral hollow tube allowing heat carrier to flow, and a gas distribution tube assembly for making powder flow (B) for supplying gas to cause the flow of molding sand or resin-coated sand for a shell mold. Furthermore, a temperature control apparatus according to the present invention comprises a reservoir for raw molding sand or resin-coated sand for a shell mold, and said temperature control unit provided in said reservoir.