To provide a rotation sensor equipped bearing capable of detecting a highly precise absolute angle with no correction work required after incorporation into a bearing installed equipment, an absolute angle sensor equipped bearing assembly includes a sensor equipped bearing 1 and a correction data storing device 20. The sensor equipped bearing 1 has a rotation detector 6 capable of providing, as a detection output indicative of the rotation angle of a rotating raceway ring relative to a stationary raceway ring, two analog outputs X and Y that are offset 90° in phase relative to each other in terms of electrical degree. The correction data storing device 20 stores a correction data for correcting an error when the absolute angle of the rotation angle of the rotating raceway ring is calculated from the two analog outputs X and Y and which is used pared with the sensor equipped bearing 1.