To provide a rolling bearing device having an oil-supply unit 10 that is energy-efficient and can supply a lubricant 14 without using a pump from a lubricant tank 15 to a rolling bearing with no time lag.

In the rolling bearing device, the oil-supply unit 10 is installed at a fixed ring side of the rolling bearing. The oil-supply unit comprises: a lubricant tank 15 that reserves a pressurized lubricant 14 and has a delivery port for the lubricant 14; a valve 16 that opens and closes the delivery port of the lubricant tank 15; a drive part 21 that drives the valve 16; and a power-supply part 22 that generates electrical energy to drive the drive part 21.