A vibrato attachment for a stringed instrument such as a violin includes a movable member which projects under the bridge of the instrument and is movable back and forth to raise and lower the bridge thereby to vary the tension of the strings of the instrument. A movable actuator is disposed outside the sound box of the instrument at a location where it is readily engaged and moved by a part of the body of the person playing the instrument. Movement of the actuator is transmitted to the member under the bridge by a connector which extends from the actuator through a hole in the sound box, a rod in the sound box and another connector which extends through a second hole in the sound box and which joins the rod and the member.