To solve a problem that it is difficult to obtain excellent accuracy of molten metal supplying quantity because the stability of quality and the improvement of yield are achieved by controlling the sucked quantity of the molten metal in a high vacuum die-casting to be poured into an injection sleeve by evacuating in the die and controlling this sucking force.

The vacuum die-casting apparatus is provided with a vacuum means for evacuating in this die, a molten metal injection device having a structure for supplying the molten metal in a holding furnace with the above vacuum means into the horizontal tube injection sleeve through a molten metal supplying pipe, a supplying furnace for supplying the molten metal into the holding furnace and a molten metal surface control means for supplying the molten metal from the supplying furnace so that the variation of the molten metal surface level in the holding furnace is ≤ 30 mm.