PURPOSE: To obtain a casting which is substantially defectless and has a sound structure by making it possible to cast molten metal at nearly a constant inflow rate from the beginning period to end period of casting.

CONSTITUTION: At the time of pouring of the molten metal into a casting mold, rotating force is applied to the molten metal to be poured at a pouring cup 16 to generate the vortex of the molten metal. This vortex molten metal is admitted into a sprue 17 along the wall of the sprue 17, by which an air column 92 where the molten metal does not exist even during pouring is formed in the sprue 17.