A peg for a stringed instrument is provided, The peg has a main body 10; a pair of bearings 12 erected at two sides of the main body so as to oppose each other, a worm gear 21 which is rotatably supported in a large diameter hole 15 and a small diameter hole 16 which has a knob 29 on one end portion, and a winding shaft 30 which is connected to the worm gear 21 via a worm wheel 40. The bearing 12 is formed of a material having spring-like properties and thus has increased elastic limit and avoids deformation.