a top inner housing (22a) housing a top roll group (21a); a bottom inner housing (22b) housing a bottom roll group (21b); an entry-side outer housing (23a) provided at entry sides of the inner housings (22a, 22b) and having an opening portion (51a) which a strip (1) is allowed to pass through; a delivery-side outer housing (23b) provided at delivery sides of the inner housings (22a, 22b) and having an opening portion (51b) which the strip (1) is allowed to pass through; sets of pass line adjusters (62a, 62b) provided in upper portions of the opening portions (51a, 51b), and pressing an entry-side pressing portion (41a) and a delivery-side pressing portion (42a) of the top inner housing (22a), respectively; and sets of roll gap controlling cylinders (64a, 64b) provided in lower portions of the opening portions (51a, 51b), and pressing an entry-side pressing portion (41b) and a delivery-side pressing portion (42b) of the bottom inner housing (22b), respectively.
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