To provide a lubricating device for a power transmission mechanism, in which reduction in filter performance of an oil strainer can be suppressed.

An oil strainer insertion space 60 extends upwardly in a perpendicular direction from a strainer inserting port 18, and a connecting part 64 between an oil circulating path 13 and a lower space 61 of the oil strainer insertion space 60 is bent within a horizontal plane.