To obtain a hybrid drive device in which manhour is reduced without sacrifice of workability when the bearing press-fit surface of a motor shaft is machined and machining of the motor shaft is facilitated, and which is made advantageous in space by shortening the overall length of a motor.

A rotational position detecting mechanism comprises a sensor stator and a sensor rotor wherein the sensor stator is secured to the motor case, a rotor end plate for locking the motor rotor is arranged on the end face of the motor rotor, the rotor end plate and the motor rotor are secured to the rotor shaft, the rotor end plate is provided with a supporting portion extending to the motor case side in the longitudinal direction of the rotor shaft, and the sensor rotor is secured to the supporting portion.