To minimize the mixing of impurities by arranging an induction coil installed surrounding the side of the outer diameter of a crucible, a melting material supplier into which a conductive material to be melted is fed from an upper part of the crucible and a die for injecting molten metal to perform working continuously within one vacuum container.

A reflector 14 is retreated spirally from above a crucible 1 by a spiraling mechanism 14a and a material to be melted is fed into the crucible 1 from a melting material supplier 4. Induction heating and a floating force by an electromagnetic force caused by an eddy current which is induced by electromagnetic induction of an induction coil 2 to be supplied from an AC power source 3 both are simultaneously applied to the melting material to make a molten metal 1a floating being melted and the molten metal is cast into a die 5 after the adjustment of casting condition. In the molten metal 1a melted by the crucible 1, the mixing of foreign matters is very limited because there is no contact with other material during the melting period. This enables the melting of even a material with a high melting point thereby minimizing heat conductivity loss.