Patent ID: 7909513

Claim:
A rolling bearing device comprising: an inner ring and an outer ring; a plurality of rolling elements being rollably disposed between the inner ring and the outer ring; a cage being provided between the inner ring and the outer ring, including: a plurality of pockets accommodating the plurality of rolling elements, respectively; and a groove extending, on one end face of the cage, circumferentially along a full circumference of the cage about a rotational center thereof, communicates with the plurality of pockets, and includes a bottom portion; a nozzle comprising a distal end portion inserted into the groove; a tank for storing lubricating oil; and a pump, communicating with the tank, for supplying the lubricating oil stored within the tank to a rolling element of the plurality of rolling elements via the nozzle, wherein a cross sectional shape of the groove is formed into a shape which expands more towards the outer ring as the groove approaches the rolling elements.