To actuate driving wheels of a vehicle in the optimum state by the power from both of the driving sources, an engine and batteries.

This engine/battery hybrid driving device is provided with a differential generator generating power by the difference is rotation speeds between an input shaft and an output shaft, and this generator/electric motor hybrid device can be alternatively connected to the input shaft side or the output shaft side by the changeover of a clutch, so that this generator/electric motor hybrid device generates power with its connected to input shaft side and electrically actuates with its connected to the output shaft side.