PURPOSE: To simplify the work of setting plural pieces of chiller components in the forming die for making the mold.

CONSTITUTION: The holding component 14 A which holds plural chiller components in the prescribed arranging state freely attachable and detachable is prepared, and plural chiller components are set in the forming die for making the mold in the state being held with the holding components 14A. Then, the chiller components 10A is separated from the holding components 14A, and only the holding components 14A are taken out from the forming die for making the mold. Then, the casting sand is filled in the forming die for making mold, the casting sand is hardened.