Abstract: A string bridge for an electric guitar includes a bridge main part formed by a generally rectangular top portion which pivots about a forward edge thereof to produce a tremolo effect, and by an integral stem portion arranged to extend vertically downwardly from the top portion into a bore in the sound body of the guitar. The lower part of the stem portion is biased by a spring mechanism at an initial position whereat the stem portion abuts a confronting surface of the bore. The pivot axis of the bridge main part is held steady relative to the sound body by way of an elongate member fixed on the body, and vibrations which would otherwise occur in the bridge main part when no tremolo effect is desired, are suppressed by the abutment of the stem portion against the confronting surface of the bore in the sound body.