An 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, the pump ejecting lubricating oil in the pressure chamber portion; 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 the state of a bearing portion; a pressure adjustment portion that adjusts a pressure of lubricating oil in the oil region which extends from the pressure chamber portion to the tank; 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.