To provide a bearing device for back up rolls, wherein grease is easily filled up when assembling, the life of a bearing is long and it resists the use for a long period with low torque.

A plurality of radial bearings 14 for loading radial load are interposed between a roll 13 and a shaft 12. A groove 25 is provided in a portion between two radial bearings 14 arranged adjacently on the surface of the inside diameter of the roll 13, and grease is filled up in the groove 25.