In order to detect rotational speed and rotational direction of an axle, achieve compact formation of the rotation detector, and be excellent in dust resistance performance, a rolling bearing apparatus includes balls interposed between respective raceway surfaces of inner and outer ring members and a seal apparatus is mounted between shoulder portions of the inner and outer ring members. The seal apparatus includes an outer ring side seal ring fixed to the outer ring member and an inner ring side seal ring fixed to the inner ring member. Moreover, a pulser ring is fixed to an inner face of a ring-like core metal of the inner ring side seal ring and on an outer diameter side of a ring-like core metal of the outer ring side seal ring. A regular and reverse rotation detecting sensor is molded by a resin-made external member to integrate.