Abstract: [Subject] In a hybrid drive power apparatus, distortional oscillation of power transfer shafts caused by fluctuation in output torque of an engine is restrained to prevent the occurrence of unpleasant noises such as hitting noise of gear teeth, harsh noise in the vehicle body and the like.

Abstract: A seat apparatus for a vehicle includes supporting member and a moving member whose position is adjustable relative to the supporting member while a posture of the moving member is in a predetermined posture comprising a link member rotatably connected to the supporting member and the moving member respectively, a first gear secured to the moving member, a second gear secured to the supporting member and a transmitting gear rotatably supported to the link member. The transmitting gear includes a first partial gear meshing with the first gear and a second partial gear meshing with the second gear.