To prevent outstanding accident, to unnecessitate the inspection and maintenance work of a stripper guard and to prevent the generation of scratch on products.

In a guiding device which is arranged on the outlet of a rolling groove at the time of manufacturing a wide flange shape by rolling, a pair of upper and lower flange guiding rollers 14a, 14a' for vertically nipping the end 19 of width of the wide flange shape and a pair of upper lower stripper guards 16, 16' situated between the flange guiding rollers 14a, 14a' and rolling rolls 15, 15' are provided, the upper and lower stripper guards 16, 16' are formed into a planar shape which is expanded toward the rolling 15, 15' and arranged providing minute clearances (≤50mm) between the guards and the rolling rolls 15, 15', and the tip of the wide flange shape is prevented from running against the stripper guards 16, 16'.