To extend a durability period of a click mechanism structured so that a click piece slides on a click surface.

The inner peripheral surface of a clicking ring member 17 provided in a body is used as a clicking surface 25 having a plurality of clicking mountains 25a. On the other hand, a housing hole opened in a peripheral surface extending in a diameter direction is provided in a cylindrical rotor, and a coil spring 27 and a click piece 26 are housed in the housing hole. A portion at the tip of the click piece 26 which makes contact with the clicking surface 25 is formed into a cylindrical surface shape (almost semi-cylindrical shape), and is formed like a stepped shape having a large diameter part 28 with an approximately 1/3 portion at the center swelling toward the tip side. At the beginning of using it, The large diameter portion 28 slides on the clicking mountain 25a of the clicking surface 25 to cause abrasion, but abrasion is caused only on a portion corresponding to the large diameter part 28, and after that, when abrasion is caused in the clicking mountain 25a to weaken the click feeling, small diameter portions 29 and 29 are then brought into contact with portions of the clicking mountain 25a where abrasion has not been caused, and the click feeling can be thereby obtained.