A starter comprises a fixing member which has a cylindrical portion and rotation stoppers on the outer wall of the cylindrical portion and is fixed to a bracket so that its movement in a circumferential direction is limited by the rotation stoppers, a mating portion is formed by mating the inner surface of the cylindrical portion of the fixing member with the outer surface of the internal gear of the epicyclic gear reduction unit, and the mating portion is set such that the internal gear slides and rotates with respect to the fixing member when rotation torque applied to the starting output shaft exceeds a predetermined value by machining the end surface of the cylindrical portion of a provisional mating portion formed by provisionally mating the inner surface of the cylindrical portion of the fixing member with the outer surface of the internal gear. Therefore, the breakage of elements of the output transmission system of the starter can be prevented.