To solve such problem that shrinkage hole, etc., is caused by shortage of feeder head pressure particularly in the case of casting a large cast product, in a sucking-up casting method of molten metal.

In the case of sucking up and casting the molten metal 16 into the inner part of a mold 38 by reducing the pressure in the mold 38, centrifugal force acts on the molten metal 16 sucked up into the mold 38 by rotating the mold 38 at high speed, and under this state, the molten metal 16 in the mold 38 is solidified to obtain the cast product having the prescribed shape corresponding to the shape of the mold 38.