A lubricating apparatus includes a rotating shaft disposed horizontally; a supporting wall supporting the rotating shaft with a bearing; an oil chamber surrounded by the supporting wall and the rotating shaft; an oil passage extending within the rotating shaft and communicating with lubricating portions; an oil intake portion for receiving and supplying the oil to the oil chamber; and a plurality of guide ribs formed in the supporting wall. The guide ribs are adapted to form at least two oil flow paths from a radially-outer portion of the oil chamber toward a center portion of the chamber.