POWER TRANSMISSION DEVICE

A vehicle power transmission mechanism according to the present invention has a first cam groove and a second cam groove of a shift cam mechanism, the first cam groove and the second cam groove have a first series mode position, a parallel mode position, an internal combustion engine direct connection mode position, a neutral mode position, and a second series mode position, which are provided in the order of the first series mode position, the parallel mode position, the internal combustion engine direct connection mode position, the neutral mode position, and the second series mode position.