Disclosed is a power transmission device wherein an electromagnetic pump (80) to which a discharge port (82b) is connected is provided in an oil passage (46) for a clutch; a branched oil passage (48) is connected to the oil passage (46) for a clutch, and a communication oil passage (49) is connected to a lubrication oil passage (66) via a check valve (88); and a second input port (52d) is formed on a manual valve (50), which blocks linkage between the branched oil passage (48) and the communication oil passage (49) when a shifting operation to a D position is performed and which links the branched oil passage (48) and the communication oil passage (49) when a shifting operation to an N position is performed. When the shifting operation to the N position is performed during stopping of an engine (12) in order to tow a vehicle, lubrication oil can be supplied to objects to be lubricated (a gear mechanism or a differential gear, bearing, etc.) of the vehicle by driving the electromagnetic pump (80).