Abstract: A tremolo device for a guitar comprising a flat plate pivotably mounted about a fulcrum on the guitar, a bar secured to the flat plate, at least one tension spring for imparting rotational force to the flat plate and the bar in one rotating direction, against another rotating force derived from a tension of guitar strings, and a tremolo arm manually engageable with the flat plate to oscillate the flat plate and the bar to thereby produce a tremolo effect. The fulcrum is provided by at least two contacts between a pin-shaped member having a substantially half-spherical tip portion on a front end thereof and a concave member having a depression into which the pin-shaped member is inserted.