A drive device for a vehicle, in which noise due to vibration of a gear mechanism such as a transmission mechanism is effectively suppressed to improve quietness of a vehicle. The drive device for a vehicle has a rotating electric machine, the gear mechanism for power transmission, and a case (C) in which the rotating electric machine and the gear mechanism are received and arranged in the direction of the axis of the rotating machine. The case (C) has a low-rigidity region (A1) located at a position corresponding to the outer periphery of the rotating electric machine, and the low-rigidity region (A1) is covered by a silencer (N) supported by a high-rigidity portion (Ph) of the case (C), which portion (Ph) has higher rigidity than the low-rigidity region (A1).