To provide large driving force by making the driving force inputted from an engine to an input shaft transmittable to an output shaft through a first and a second epicyclic gear, providing a plurality of motors, and making the rotating members of the epicyclic gears connectable to the rotors of a plurality of motors, respectively.

Various drive modes are selected by a control such as the rotation control of a first ring gear 14b and a first rotor 42, the rotation control or fixation to a case 36 of a second sun gear 22 and a second rotor 50, or the generation and drive or integration of both the motors 58, 60 to travel a motor vehicle. The torque inputted from an engine 30 to an input shaft 32 and the drive torque of the first motor 58 are decelerated in a large deceleration ratio by the first epicyclic gear 10 to driven an output shaft 40. Both the first motor 58 and the second motor 60 overlap each other in the axial direction, whereby the total length is reduced, and the whole drive unit can be made compact by use of two sets of epicyclic gears 10, 20.