PURPOSE: To prevent distorted deformation and to improve surface roughness by packing powder into a mold composed of a soft elastic material, setting the molded article pressurized in a low pressure region into a mold composed of a soft elastic material and subjecting the powder and molded article to press molding under a high pressure.

CONSTITUTION: The powder 6 is packed into the first mold 1 and after its aperture is closed, a pressure medium is introduced between pressurizing rubber 5 and a high-pressure vessel 2 from an introducing hole 7. The pressurizing pressure is set at a low pressure to yield the molded articles 21 which can be handled. The first molded article 21 is taken out after the pressurization treatment and is set into the second mold 11, by which the molded article is subjected to the pressurization treatment under the high pressure and the second molded article 22 is obtd. A hard material is used for the elastic material 5 of the second mold 11 to prevent remaining of the shape of the powder 6 on the surface of the second molded article 22. The soft elastic material 5 capable of following up the shrinkage of the powder 6 is used for the first mold 1 which is large in change of apparent density and, therefore, the distorted deformation, such as elephant leg phenomenon, is prevented.