A compact rolling bearing with a rotation sensor is proposed which has a shortened
axial length of a housing for mounting the rotation sensor. The rolling bearing
comprises a rotating bearing ring and a fixed bearing ring, and the rotation sensor
comprises a rotating element mounted to the rotating bearing ring and a detecting
element mounted on the fixed bearing ring so as to oppose the rotating element,
and an electric circuit board. The electric circuit board has a flexibility. With
this arrangement, it is possible to mount the electric circuit board in a curved
state in a limited space on a peripheral wall of the sensor housing, and thus to
shorten the axial length of the sensor housing. This provides a compact rolling
bearing with the rotation sensor. Another embodiment has a magnetic encoder, the
binder for which is heat-resistant nitrile rubber, fluorine rubber or silicone rubber.
