PURPOSE: To produce economically a casting having high quality with good workability by extending and projecting the top end of a casting mold sleeve into a melting crucible and heating said end with a molten metal in the crucible.

CONSTITUTION: A casting mold sleeve 3 is embedded into the bottom of a crucible 2 so as to penetrate said part and the top end 3a of the sleeve is projected to extend for about suitable length into the crucible 2. Such top end is used as a pouring port 3'. A starting rod 7 is preliminarily inserted into the sleeve 3 and after the material to be melted in the crucible 2 is melted, pinch rolls 10 are pulled out to meet the solidifying rate of the molten metal A' in the top end 3a of the sleeve 3 by which a billet (a) is continuously cast. The billet which is free from solidification, breakdown, rough surface and flaw, has a smooth surface and does not contain oxide, etc. is obtd. until the top surface of the molten metal A arrives at the port 3' of the sleeve 3.