An oil lubricating structure includes a main body case (6) having a housing chamber (62a) in which a first dynamotor (2) is housed; an oil sump (7) which is provided below the main body case (6) and has an oil chamber in which oil collects; an oil supply portion which has an inlet port (75a) through which oil is drawn in from the oil chamber and which supplies oil collected in the oil chamber to the first dynamotor (2) through the inlet port; and an oil return hole (63a) which is formed in a bottom surface of the main body case (6) toward the front of the oil sump (7). A duct member (73) is provided in the oil chamber. One end portion (73a) of the duct member (73) is connected to the oil return hole (63a) and the other end portion (73b) of the duct member (73) is positioned farther to the rear than the inlet port (75a). Thus, an oil lubricating structure, which can prevent air from being sucked into the inlet port (75a) with the condition that the oil sump (7) and the main body case (6) are forward tipping when the vehicle is braked or move downwards, is provided.