A power transmission apparatus for a vehicle includes a first input shaft directly connected to an engine, a second input shaft enclosing the first input shaft and rotating independently from the first input shaft and selectively receiving torque of the engine through a first clutch, a third input shaft enclosing the second input shaft and rotating independently from with the second input shaft and selectively receiving the torque of the engine through a second clutch, an intermediate shaft disposed in parallel with the first, second and third input shafts, a transfer gear fixedly disposed on the intermediate shaft and outputting torque of the intermediate shaft, a first shifting member, a second shifting member, and a third shifting member for changing the torque of the engine.