To provide a miniaturizable fixed structure for a cam follower, which can be firmly mounted even without high accurate control by setting fitting tolerance of an insertion part to a tight fit in the case of insertion fixing to a driven member,

In the case that a stud base part 31b of a cam follower 1 is fixedly inserted in an insertion hole 3d of a driven member 3, a recessed part 31c having a conical surface with a stud axial center serving as the center is formed in an end face of the stud base part 31b, a wedge member 5 having a truncated cone-shaped part is press fitted to this recessed part 31c, and it is diametrically spread and deformed, so as to fixedly interpose the stud base part 31b by the driven member 3. The wedge member 5 and a stud 31 are tightened by a screw member 7, and the wedge member 5 is press-fitted into the recessed part 31c. A stepped part 31k protruded outward in a radial direction to abut on the driven member 3 is integrally formed in a rear edge in an insertion direction of the stud base part, and a lock part 5t abutting on the driven member 3 is integrally formed in a condition of tightening the wedge member 5 and the stud base part 31b in a large diameter side of the wedge member 5.