PURPOSE: To separate including gas and to obtain a cast ingot without defect by stirring semi-solidified metal slurry in a tiltable mixing vessel while adjusting the temp., slowly tilting the vessel introducing the slurry into a shaping mold providing an exothermic material at the upper part and a chill block at the lower part and slowly casting.

CONSTITUTION: While forcedly cooling and stirring molten metal or alloy, the semi-solidified metal slurry having the form dispersing the fine solid-phase particles in the liquid-phase is manufactured. This slurry is shifted into the tiltable mixing vessel 1 and introduced in the condition of a specific solid-phase ratio by a heater 5 and a rotary stirrer 2. The rotary stirrer 2 is pulled up from the mixing vessel 1 by a lifter 15 and reserved. A trunnion 4 is slowly rotated by a motor for tilting through a speed reducer and by tilting the mixing vessel 1, the slurry is flowed down to a pouring passage 6 and shifted to the ingot mold 7. As the slurry is quickly cooled from the lower part by the chill block 8 while delaying the solidification by the effect of the exothermic material 9 provided in the mold 7, the including gas is floated up and separated and also, while preventing the development of shrinkage cavity, the slurry is solidified.