The mounting position of a winding shaft on a main body is changed, and a peg may be mounted in various stringed instruments by miniaturizing the main body or reducing the thickness thereof. The peg for the stringed instrument includes a main body mounted in the stringed instrument; a worm rotatably supported by the main body, the worm having a knob at an end thereof; a worm wheel engaging with the worm, the worm wheel rotatably supported by the main body; a winding shaft connecting to one side of the worm wheel in an axial direction, the winding shaft for winding a string of the stringed instrument; and bearing holes formed in at least two surfaces of the main body, the bearing holes supporting the winding shaft rotatably.