To provide a method capable of obtaining easily and stably a large-sized compact.

The method for producing a compact is used to produce the compact by using a cold isostatic pressing, and is characterized in that the compact is obtained by preparing a molding die made from a soft material, which has at least one or more partition dies for dividing an inner space of the molded molding die, by filling a powder for molding in the inner space separated with the partition die, by putting this into a pressure vessel of the cold isostatic pressing device, and by pressurizing the powder for molding with isotropic pressure.