To provide a sealing device with a multipole magnet encoder, which has a simple and inexpensive construction for improved reliability and durability, and also to provide a rolling bearing equipped therewith and a wheel supporting bearing unit.

The sealing device comprises a first seal member 13 to be fixed to an inner ring 2, and a second seal member 17 to be fixed to an outer ring 3. The first seal member 13 consists of: a first cylinder portion 14 to be fixed to the inner ring 2; and a first disc portion 15 extending from the first cylinder portion 14 to the radial direction, while the second seal member 17 consists of: a second cylinder portion 18 to be fixed to the outer ring 3; and a second disc portion 19 extending from the second cylinder portion 18 to the radial direction. The end of the second disc portion 19 forms seal regions 22, 23 in contact with the peripheral face of the first cylinder portion 14, and the multipole encoder 1 is arranged in contact with the inner face of the first disc portion 15 and clamped by a back yoke 16.

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