PURPOSE: To simplify the maintenance and checking of an inclined rolling mill by arranging the driving sources of a pair of inclined rolls at positions nearly equal to each other in height.

CONSTITUTION: Perforating rolls 1L, 1R are rotated around the pass center (m) as a center and the connecting points P, P of driving shafts 2L, 2R with a driving source are placed at the same height as the pass center (m). At this time, a shop floor surface does not require large grooves or pedestals for storing the driving sources and labor and cost for constructing the inclined rolling mill can be saved. Further, the shaft centers of these driving shafts 2L, 2R can be made nearly horizontal and at this time, steps between perforating rolls 1L, 1R, driving shafts 2L, 2R and perpendicular directions of the driving sources are small.