PURPOSE: To reduce the dispersion of unit wts. of mold irons and to improve an yield and productivity by setting a mold trough for supplying molten iron into both mold groups between endless type mold groups so as to be possible to tilt in the right and left direction and providing an inclination driving device for mold trough.

CONSTITUTION: While shifting positions of mold connecting parts of the endless type mold groups 8, 8 in the right and left sides, the mold groups 8, 8 are shifted and just before the molten iron casting stream position from the molten iron casting trough 7 reaches the mold connecting part, by tilting the molten iron casting trough 7, the molten iron casting is interrupted and by tilting the molten iron casting trough 7 after the mold connecting part passes through, the molten iron casting is restarted. By this method, the molten iron casting to the mold connecting part can be avoided, and it is prevented that the molten iron stream is directly dropped to the connecting part of the molds.