In a slab continuous casting machine comprising a tundish (1) for reserving a molten steel therein, a nozzle holding cassette (3) disposed on an outer bottom portion of the tundish, a mold (2) for use in a casting, and an immersing nozzle (N) mounted in the nozzle holding cassette and for pouring the molten steel in the tundish into the mold, the cavity has a generally rectangular sectional shape defined by a pair of short sides and a pair of long sides. When the immersing nozzle is inserted into the mold and when the immersing nozzle is taken out from the mold, a movement of the immersing nozzle gripped by a handling arm (4) in the mold is limited in a direction parallel to the pair of short sides.
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