To provide a casting method with which occurrence of shrinkage hole at the upper part of a cast ingot is restrained when magnesium alloy is cast as the cast ingot.

Before pouring molten magnesium alloy into a mold, the top part of the mold is heated under condition satisfying the following (1) and (2) formulas. A≥20%...(1), B≥100°C...(2) Wherein, A=(a/h)×100 and (a) is length at the heating upper part of the mold containing the position corresponding to the molten metal surface and (h) is the total height of the molten metal surface in the mold just after pouring and B is the inner surface temperature of the mold. Further, as the other way, the pressure is started to give to the upper part of the cast ingot while the non-solidified molten metal exists on the upper part of the cast ingot, and the solidification is completed under state of giving the pressure.