PURPOSE: To obtain a uniform powder molding using a hydrostatic pressure press by connecting a powder filling device having a powder reservoir on the rotation shaft to a mold and rotating at high speed and thereby filling the powder densely to every nook and corner of cavities.

CONSTITUTION: A powder filling device is connected to a mold 1 having cavities 6, 7 of required shape and roatated at high speed around a rotation symmetric axis 3. Since a powder reservoir 2 is provided on the rotation shaft of the powder filling device, generation of centrifugal force is restrained, and the powder flows easuly in vertical direction and filled densely to every nook and corner of cavaties 6, 7. This preformed product is pressed at cold by a hydrostatic pressure press in a high pressure medium and a uniform powder molding is obtained.