Rolling bearing device and oil supply unit

A rolling bearing device comprising:

• a bearing portion that has an inner ring, an outer ring, and a plurality of rolling elements provided between the inner ring and the outer ring;
• and
• an oil supply unit provided adjacent to the bearing portion and configured to supply lubricating oil to the bearing portion, wherein
• the oil supply unit has:
• a pump that has a pressure chamber portion that stores lubricating oil and a piezoelectric element that is deformable by application of a voltage to vary a volume of the pressure chamber portion, the pump ejecting lubricating oil in the pressure chamber portion as the volume is reduced;
• a tank that is connected to the pump and that stores lubricating oil to be supplied to the pump for replenishment;
• a sensor that detects a pressure in an oil region which extends from the pressure chamber portion to the tank and in which lubricating oil is present, or a state of the bearing portion;
• a pressure adjustment portion that selectively adjusts a pressure of lubricating oil in the oil region which extends from the pressure chamber portion to the tank and in which lubricating oil is present;
• and
• a control portion that controls at least one of the pressure adjustment portion and the piezoelectric element on the basis of a detection result from the sensor.