To provide a backup roll and a bearing device with a high degree of accuracy at reduced costs from the different viewpoint from conventional cases.

By holding a small cylindrical portion 32 with the bearing device 20 on a holding portion 40, the factor to cause such an eccentricity that the outer peripheral surface of large cylindrical portions 31, 31 swings, is limited only to dimensional accuracy of a roller 21, the small cylindrical portion 32 and the large cylindrical portion 31 so that it is feasible to hold the intermediate roll with a higher degree of accuracy.