POWER TRANSMISSION DEVICE

The present invention provides a power transmission apparatus that is able to have an increased clutch capacity while being prevented from increasing in size in an axial direction. [0002] An auxiliary clutch plate 17 different in diameter from driving and driven clutch plates 6 and 7 is disposed in a clutch housing 2. When the driving and driven clutch plates 6 and 7 are pressed against each other, the auxiliary clutch plate 17 is pressed so as to enable transmission of a driving force of an engine E to a driving wheel T. When a pressing force exerted on the driving and driven clutch plates 6 and 7 is released, a pressing force exerted on the auxiliary clutch plate 17 is released so as to cut off transmission of the driving force of the engine E to the driving wheel T.