To allow easy work for fabricating a cam follower and reduce the weight and size without a decrease in loading.

The cam follower comprises a shell roller bearing 13 provided on the outer periphery of a supporting shaft 10 mounted between a pair of side walls 5, 6 opposed to each other in mutually spaced relation. The shell roller bearing 13 consists of an outer ring 11 having collar portions 11b, 11c at both axial ends of a shell cylindrical portion 11a extending to the inner diameter sides and a plurality of rollers 12 arranged on the inner periphery side of the outer ring 11. Desirably, the shell roller bearing is in a total roller shape or has the outer ring 21 whose cylindrical portion 21a has a plate thickness greater than the plate thickness of each of the collar portions 21b, 21c.