Abstract: An operating lever system not requiring packing for preventing noise and any special function portion which reduces the number of parts and number of assembly steps and reduces the costs, that is, an operating lever system wherein the cam groove is formed in it middle portion with sharp bends where the curvature sharply changes, a front end of a pin is provided with a slit extending substantially in parallel to the two side walls of the cam groove and having a predetermined depth from the front end of the pin, at least part of the portion of the pin circumference substantially corresponding to a predetermined depth of the slit contacts the side walls without clearance, and the other portion of the pin circumference has a clearance from the side walls.