To reduce loss in rolling efficiency caused by the weight limitation of a metallic billet by restriction of a heating furnace or the like and to reduce pass-in-time (time while a metallic sheet is bitten in a rolling mill), which is impossible by a method for rolling the metallic sheets which are arranged in series in the direction of the line in the reverse rolling of the metallic sheet.

A series of reverse rolling is performed in the lump by arranging a plurality of metallic sheets in the direction of the rolling line until broadside rolling, and the plurality of metallic sheets are arranged in parallel in the direction of the rolling line by turning the metallic sheets at 90° after completing the broadside rolling and finish rolling is performed simultaneously.