70 is mounted on the outer member 51. The first sealing ring 70 has a metal core 72 with a substantially L-shaped cross-section. A sealing member 73 is mounted on the metal core 72. The sealing member 73 includes a main lip 73a and an auxiliary lip 73b. 
The second sealing ring 71 is mounted on the inner ring 56. The second sealing ring 71 has a metal core 74 with a substantially L-shaped cross-section. A radial lip 75 is mounted on the metal core 74. A pulser ring 76 is mounted on the second sealing ring 71. The pulser ring 76 includes a metal core 77 with a substantially C-shaped cross-section. The pulser ring 76 is fit onto the metal core 74. A multi-pole magnet rotor 78connector 81 is formed to project radially outward and vertically to the axis of the bearing. Thus, a strong pressing force is applied to the first sealing ring 70, the magnetic sensor 80, via the connector 81, and thus the sensor holder 79 during connection of the connector 81. Accordingly, the positional accuracy of the first sealing ring 70 and the magnetic sensor 80 tends to be diminished. Additionally, the sensor holder 79 itself, made of plastic resin, may be broken.