BEARING WITH ROTATION SENSOR

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PROBLEM TO BE SOLVED : To avoid malfunction of a sensor caused by an influence of a leakage magnetic field in a bearing with a rotation sensor used by being integrated into a motor or the like. SOLUTION : A rare earth-based material or an Alnico-based material is used as a magnetic material for a magnetic encoder 13 which is a constituent member of this bearing with the rotation sensor, to thereby generating a stronger magnetic force than a conventional ferrite-based material, and to be hardly influenced by the leakage magnetic field in the sensor operation.