A power transmission device for a hybrid vehicle, comprising: first clutch means that is disposed in a drivetrain extending from an engine (E) installed in the vehicle to a driving wheel (D) and that is capable of transmitting or cutting off driving power of the engine (E) to the driving wheel (D); second clutch means that is disposed in a drivetrain extending from a motor (M) installed in the vehicle to the driving wheel (D) and that is capable of transmitting or cutting off driving power of the motor (M) to the driving wheel (D); and an oil pump (P) that is connected to the motor (M) and that is capable of supplying oil to a predetermined moving component disposed in the vehicle by using the driving power of the motor (M), wherein the power transmission device is capable of appropriately operating the first clutch means and the second clutch means in accordance with driving conditions of the vehicle, wherein the power transmission device includes a transmission (A) that is disposed in a drivetrain between the engine (E) and the motor (M) and the driving wheel (D) and that is capable of adjusting rotation speed of the motor (M), and the power transmission device is capable of supplying oil by causing the motor (M) to rotate the oil pump (P) at an appropriate rotation speed, and characterised in that when the vehicle is driven by the driving power of the engine (E) and when the motor (M) rotates the oil pump (P) while the second clutch means cuts off the driving power of the motor (M), the power transmission device rotates the oil pump (P) at a rotation speed lower than that of a case where the second clutch means is engaged. first clutch means that is disposed in a drivetrain extending from an engine (E) installed in the vehicle to a driving wheel (D) and that is capable of transmitting or cutting off driving power of the engine (E) to the driving wheel (D); second clutch means that is disposed in a drivetrain extending from a motor (M) installed in the vehicle to the driving wheel (D) and that is capable of transmitting or cutting off driving power of the motor (M) to the driving wheel (D); and an oil pump (P) that is connected to the motor (M) and that is capable of supplying oil to a predetermined moving component disposed in the vehicle by using the driving power of the motor (M), wherein the power transmission device is capable of appropriately operating the first clutch means and the second clutch means in accordance with driving conditions of the vehicle, wherein the power transmission device includes a transmission (A) that is disposed in a drivetrain between the engine (E) and the motor (M) and the driving wheel (D) and that is capable of adjusting rotation speed of the motor (M), and the power transmission device is capable of supplying oil by causing the motor (M) to rotate the oil pump (P) at an appropriate rotation speed, and characterised in that when the vehicle is driven by the driving power of the engine (E) and when the motor (M) rotates the oil pump (P) while the second clutch means cuts off the driving power of the motor (M), the power transmission device rotates the oil pump (P) at a rotation speed lower than that of a case where the second clutch means is engaged. <EOS>