To provide a spindle supporting device for rolling mills with which inclined spindles are directly supported freely rotatably, work is possible without breaking down the spindles in the case the bearings are changed and maintenance are needed and grease lubrication in a bearing is executed.

In a driving system for shape rolling mills in which driving force is transmitted from a pair of upper and lower driving shafts to the rotary shafts of a pair of upper and lower horizontal work rolls by respectively connecting the spindles 8, 9 to the connecting parts at both ends through universal joints, in the spindle supporting devices for supporting the approximate middle position in the longitudinal direction of each of the upper and lower spindles 8, 9, roller bearings 25 are used for the bearings 22 for supporting the outer peripheral surfaces of the spindls freely rotatably, the bearing box 28 of the upper-side spindle having the bearing 22 is freely swingably hung with a hydraulic cylinder 36, on the other hand, the bearing box 28 of the lower- side spindle having the bearing 22 is freely swingably lifted with the hydraulic cylinder 40 and the pressure with each hydraulic cylinder 36, 40 is respectively set to the magnitude by which the dead weight of the spendles 8, 9 is cancelled.