To provide a method for manufacturing precision casting parts only by using the ordinary water and an inexpensive mold.

The water is poured into a synthetic resin-made mold, in which the reverse outlines corresponding to the outlines of the parts are recessedly arranged as plural cavities, and this water in the mold is frozen in a freezing chamber to form ice patterns. The ice patterns are taken out by disassembling the mold and these are dipped into a slurry having suspended fine powder of refractory, and after coating the slurry film on the surface of the ice pattern, these are taken out from a vessel and dried. A refractory-made mold formed by repeating such works of prescribed times, is carried out from the freezing chamber and the ice patterns in the mold are melted and eliminated when these are left in a room temperature. After burning the mold formed as the cavity state in a burning furnace, molten metal is poured into the cavity. After cooling, cast parts are cut off from a sprue and runners and carried out to a prescribed finish process to manufacture a necessary product.