The invention provides an actuator and a method for producing same. In the prior art, since recesses are formed by striking balls against surfaces that are in sliding contact so as to plastically deform the surfaces, the surfaces become work hardened, and therefore, the depth to which the recesses are formed is inadequate, leading to an inadequate amount of lubrication by lubricant inside the recesses. Fine particles of silicon carbide having diameters of 0.5 to 100 [mu]m, which have been crushed so as to form angles on a surface, are shot against a roller large end face (21) of a tapered roller (3) of a tapered roller bearing (1), thereby shaving off the surface in recess shapes with diameters ranging from 0.5 to 100 [mu]m, and forming a myriad of recesses that are formed separately to each other in a non-continuous fashion at a depth of at least 1 [mu]m and spaced at no more than 200 [mu]m. The recesses serve as oil reservoirs. Since the recesses are shaved off rather than being plastically deformed, the surface is not hardened.