The power transmission apparatus is a power transmission apparatus mounted on a vehicle. A gear chamber includes a gear accommodating portion used for accommodating a gear and a strainer accommodating portion used for accommodating an oil strainer. The gear accommodating portion and the strainer accommodating portion are disposed abreast in an axial direction. One clutch chamber of a pair of clutch chambers adjacent to the strainer accommodating portion only directly communicates with the strainer accommodating portion of the gear accommodating portion and the strainer accommodating portion, and the one clutch chamber communicates with the gear accommodating portion only by using the strainer accommodating portion.