PURPOSE: To simplify a structure, to precisely and surely supply molten metal having a prescribed quantity at every time and to shorten the space in the upper direction by lowering the height of a molten metal weighing and pouring valve device.

CONSTITUTION: A molten metal holding part 1 and an injection sleeve 5 in a die casting machine are connected with a molten metal feeding tube 4, and a suction tube 11 composed of siphone part 11A and a molten metal sucking-up part 11B mutually communicated with a molten metal delivering side end part 4a of the molten metal feeding tube 4 and cross-communicated with the molten metal feeding tube 4, is arranged. The siphone part 11A is dipped into the molten metal 2 in the molten metal holding part 1, and the molten metal sucking-up part 11B is connected with a vacuum device 13 and the molten metal 2 in the molten metal holding part 1 is fed to the molten metal feeding tube 4 by vacuum suction. On the other hand, the molten metal weighing and pouring valve device 20 is arranged at a molten metal discharging side end part 4b of the molten metal feeding tube 4.