PURPOSE: To produce economically many shape steels having different sectional sizes with high accuracy by adjusting the height of the rough shape steel formed from a material to be rolled then adjusting the space between bisected horizontal rolls and subjecting the shape steel to finish rolling.

CONSTITUTION: A rough shape steel having a web thickness tu, web inside width wu and web height Wu is worked by rolls having a width wi to a finish web thickness tF only in the part L2 out of the web. The section wi-L is maintained at the thickness tu. The web inside width of the intermediate blank material is then made wie and the web height Wie. The part of the thickness tu under no rolling down is worked to the thickness tF by the rolls having a width wie to work the entire part of the web inside width to the thickness tF so that the web inside width is made wef and the web height Wef. The spaces among horizontal rolls 21, 22, 23, 24 are adjusted according to the sectional size of the material to be rolled by using the rolls 21, 22, 23, 24 for web rolling movable in the height direction of the web and vertical rolls 29, 30 as finish rolling.