Disclosed is a power transmission apparatus for an automobile comprising an engine 1, a generator 15 driven by an output of the engine 1, and a motor 29 driven by a generation output of the generator 15 and a discharge output of a battery 47, wherein a clutch mechanism 23 is provided between an output shaft of the engine 1 and an output shaft of the generator 15. In a hybrid vehicle, a loss caused by an inertia torque of the generator can be avoided.