A drive unit is configured to prevent an auxiliary electric motor from being rotated, which could otherwise cause the back electromotive voltage thereof to exceed the maximum rated voltage. The drive unit includes a drive source, a shaft, an auxiliary electric motor, and a clutch. The shaft is configured to transmit a torque outputted from the drive source. The clutch is disposed between the shaft and the auxiliary electric motor. The clutch is configured to allow transmission of a mechanical power from the auxiliary electric motor to the shaft regardless of whether the mechanical power is intended for forward rotation or reverse rotation, while being configured to block transmission of the torque from the shaft to the auxiliary electric motor regardless of whether the torque is intended for forward rotation or reverse rotation.