A hybrid power train for vehicles, including a drive shaft rotated by engine power, an engine-side drive gear concentrically installed on the drive shaft so as to be rotated by drive shaft power, first and second power transmission control units configured to form different power transmission paths for transmitting power from the drive shaft to the engine-side drive gear, and to control respective power transmission states, an output shaft arranged in parallel to the drive shaft, an engine-side driven gear rotatably provided on the output shaft so as to mesh with the engine-side drive gear, a clutch unit for switching the operating state of the engine-side driven gear between a fixed state and a released state relative to the output shaft, a motor-side drive gear rotated by motor power, and a motor-side driven gear fixedly provided on the output shaft so as to mesh with the motor-side drive gear.