Rolling bearing

A rolling bearing comprising:

• a stationary ring;
• a rotating ring;
• a plurality of rolling elements provided circumferentially rotatably in an annular space defined by the stationary ring and the rotating ring;
• a retainer configured to retain the rolling elements rotatably;
• and a pair of seal devices configured to seal an opening end portion of the annular space, the rolling bearing, wherein:
• fitting grooves of the rotating ring for mounting the seal devices are respectively formed on both end surfaces of the rotating ring into shapes symmetrical about the rolling element, that seal grooves of the stationary ring are respectively formed on both end surfaces of the stationary ring into shapes symmetrical about the rolling element;
• and
• each of the pair of seal devices is configured by connecting a fitting portion made of an elastic material to be fit to the fitting groove to an end portion of each core metal, and by connecting a seal lip portion made of an elastic material to be brought into sliding contact with the seal groove to the other end portion of the one of the core metals, the pair of seal devices are respectively formed into shapes symmetrical about the rolling element, and a magnet portion facing a magnetic sensor of a magnetic encoder is bonded to one of the core metals, while the other core metal is covered with the elastic material.