| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing unit of small diameter for a compact car having a structure to reliably detect the rotational speed. SOLUTION: An inner side of a permanent magnet 21 constituting an encoder 19b externally fitting an end of an inner ring 6 is located in the axial direction inward of an inner end face of a caulked portion 34 formed on an inner end of a hub 5a. In this configuration, the distance between a detection unit of a sensor 23 and the inner side of the permanent magnet 21 is reduced to solve the above problem even taking into consideration the prevention of interference of the caulked portion 34 with the sensor 23.
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