To secure a degree of freedom in designing a seal ring such as a combined seal ring and to reduce the cost for the seal ring.

In this rolling bearing unit with a tone wheel comprising a plurality of rolling elements 14 mounted between an outer ring 9a and an inner ring 13, the seal ring 16 such as the combined seal ring mounted between an end part outer peripheral face of the inner ring 13 and an end part inner peripheral face of the outer ring 9a for sealing between both peripheral faces, and the tone wheel supported on the end part of the outer ring 9a concentrically with the outer ring 9a, the tone wheel 17 is mounted independently from the seal ring 16, and an inner peripheral edge of the tone wheel 17 is close to an outer peripheral edge of the inner ring 13 to constitute a labyrinth seal, thus the load of the seal ring 16 is reduced.

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