The string securing apparatus for string instrument of this invention arranges a plurality of saddle-attaching members on the top face of a bridge base in correspondence with strings, and secures them to the bridge base so that they can be movably adjusted in the front-rear direction. A bridge saddle is attached to each saddle-attaching member so as to rotate up and down. The string is inserted through a pipe section in the bridge saddles and led above the bridge saddles by a lever attachment hole; the string is curved forward to a string supporting section. A cam lever is inserted in the lever attachment hole of the bridge saddles so as to freely rotate, and a spring presses the cam lever forward. A cam section of the cam lever pushes the string and secures it by tightening it to the string supporting section.