Vehicle driving device

A vehicle driving device to be mounted on a hybrid vehicle, the vehicle driving device comprising:

• an engine configured to be coupled to wheels of the vehicle via a power transmission path;
• a transmission mechanism disposed on the power transmission path;
• a motor generator disposed on a path coupling the engine and the transmission mechanism in the power transmission path;
• a first power transmission mechanism disposed on a path coupling the engine and the motor generator in the power transmission path, the first power transmission mechanism comprising a first large-diameter rotator that is coupled to the engine and a first small-diameter rotator that is coupled to the motor generator, the first large-diameter rotator being larger in diameter than the first small-diameter rotator;
• and
• a second power transmission mechanism on a path coupling the motor generator and the transmission mechanism in the power transmission path, the second power transmission mechanism comprising a second small-diameter rotator that is coupled to the motor generator and a second large-diameter rotator that is coupled to the transmission mechanism, the second large-diameter rotator being larger in diameter than the second small-diameter rotator.