To form pressurizing cast components having the same characteristics as the characteristics of the pressurizing cast components formed by a cold chamber method even if the final pressure is lower in a hot chamber pressurizing casting method.

Pressure vibration is generated in at least the narrowest section of the coupling parts between a riser hole and orifice and a mold after packing of the mold and the rapid solidification of molten metal is blocked by such vibration in the method of driving the hot chamber pressurizing casting machine. The additional pressurizing acting on the molten metal in the mold is made higher than in the conventional hot chamber pressurizing casting method, by which the cast components having the higher quality are obtained.