PURPOSE: To provide a metal melting and holding furnace for supplying the molten of aluminum alloy, etc., into an injection sleeve in a die casting machine, in which heat radiation is reduced and the oxidation caused by contact of the molten steel with the air is reduced as for as possible and the energy saving effect is high and the maintenance is easily executed.

CONSTITUTION: This furnace is constituted with a cylindrical furnace body 1 provided with a narrow molten metal supplying hole 1a and a movable cover 1A, a trough-like box body 2 connected to the upper end of the furnace body 1 and provided with a weighing molten metal pouring valve device 10 for discharging the molten metal at the tip part and extended in the horizontal direction, a weir 4 arranged at the boundary part between both bodies and a pressure sealed cylindrical body 3 held by charging into the furnace body 1 and having an opening part at the lower end and provided with a cover 3A at the upper end.