PURPOSE:To smoothly and quickly execute change of width during casting by setting one pair of right and left side guides forming the bottom part as the same arc state as peripheral surface of a mold roll above the one pair of the mold rolls in plural sets, slidingly shifting in the right and left directions and abutting on the upper part thereof. CONSTITUTION:At both end parts in barrel length direction of the mold rolls 1, 2 in a twin roll continuous caster for continuously casting as a strip 3 from gap G between the mold rolls 1, 2 while solidifying molten metal 7 supplied into between one pair of right and left mold rolls 1, 2 horizontally arranged, one pair of right and left side guide bodies 4a, 4b, 4c formed with the bottom part to the same arc state as he peripheral surfaces of mold rolls 1, 2 are arranged as parallel to barrel length direction of rolls in plural sets. Each right and left side guide bodies 4a, 4b, 4c in a set corresponding to casting widths W0, W1, W2, W3 are slid along peripheral surfaces of mold rolls and as the casting width is changed by facing these guide bodies above the gap G, the width changing can be smoothly and quickly executed even during casting.
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