Patent ID: 7431509

Claim:
A bearing with a rotation sensor comprising a bearing including a rotation-side race and a fixed-side race, and a rotation sensor detecting rotation of a rotating object on which said rotation-side race is mounted, characterized in that wherein said rotation sensor comprises: a sensor housing having a sensor and mounted on said fixed-side race; a sensor target ring having a detector sensed by said sensor and separated from said rotation-side race; and connecting means provided so as to selectively change over a state in which said sensor housing and said sensor target ring are connected and a state in which they are disconnected, wherein said connecting means comprises: a fixed-side recess formed in the sensor housing; a rotation-side recess formed in the sensor target ring so as to be opposed to said fixed-side recess; and a connecting shaft provided such that it can be displaced to a first position between said fixed-side recess and said rotation-side recess, or a second position in which it is held in either one of said recesses.