There are provided a melting furnace including a containing space for containing a melt of nonferrous metal, a magnetic field generating device, a magnetic flux therefrom, from outside penetrates the melting furnace for containing the melt to run through the containing space in a direction; and at least one pair of electrode terminals, the electrode terminals facing each other with a predetermined distance in a direction crossing the direction of the magnetic flux at a certain angle, and being capable of connecting to a power supply.