The present invention relates to a hybrid drive device including a first shaft coupled to an internal combustion engine, a rotary electric machine, a second shaft disposed coaxially with the first shaft and coupled to the rotary electric machine and a speed change mechanism, a clutch is provided to switch on and off transfer of a drive force between the first shaft and the second shaft, and a case houses the first shaft, the second shaft, the rotary electric machine, and the clutch. A rotor of the rotary electric machine is fixed to an outer peripheral portion of the clutch housing. A first seal mechanism is disposed in contact with an outer peripheral surface of the large diameter portion of the second axially projecting portion and the inner peripheral surface of the first axially projecting portion, and side by side with the first support mechanism in the axial direction.