A bearing lubricating structure for a rotating shaft includes: a pair of bearings that are disposed spaced-apart in an axial direction within a support case, for rotatably supporting the predetermined rotating shaft around an axis thereof; and an oil supply port that is disposed on the support case, for supplying lubricating oil for lubricating the pair of bearings to between the pair of bearings, between the pair of bearings and between the oil supply port and the rotating shaft, a separator being disposed in the axial direction, for receiving the lubricating oil supplied from the oil supply port to prevent the lubricating oil from directly adhering to the rotating shaft, the separator being integrally fixed to the support case, and the separator having at its axially opposite ends thereof a pair of sidewalls confronting the pair of bearings and projecting from the opposite ends toward an inner circumferential surface of the support case to be in intimate contact with the inner circumferential surface, and the pair of sidewalls each including a communication hole that permits the lubricating oil supplied from the oil supply port to flow toward the pair of bearings at a predetermined flow rate.