[Problems to be Solved]The object of the present invention is to provide a stringed instrument which can maintain sound volume at a specific level, optimize vibration of strings and resonance of body and improve balance of the sound volume and sound quality in the treble side tone and the bass side tone.[Means for Solving the Problems]A force is applied to a front end of said tailpiece for rotating a front end of a tailpiece in a direction from a portion to which a string having a high basic frequency is fastened to a portion to which a string having a low basic frequency is fastened so that a load applied from the string having a high basic frequency to a bridge decreases and a load applied from the string having a low basic frequency to the bridge increases.