Power transmission apparatus and lubricating structure of power transmission apparatus

A power transmission apparatus and a lubricating structure thereof suppress interference with circulation of a lubricating liquid supplied to a power transmission element and more smoothly guide the lubricating liquid. The lubricating structure includes a rotary shaft; a power transmission apparatus having a power transmission element disposed on an outer circumference of the rotary shaft and formed by alternately stacking frictional members; and a flow channel which guides a lubricating liquid that performs lubrication of the power transmission apparatus to the power transmission element. Thepower transmission element includes an inner circumferential cylindrical section rotated integrally with the rotary shaft, an outer circumferential cylindrical section rotated integrally with the frictional member, and a disk section configured to connect the inner circumferential cylindrical section and the outer circumferential cylindrical section. A lubricating liquid discharged from the flowchannel is guided to the d