a tuning - fork type vibration gyro enables to suppress pyroelectric noise caused by temperature change and to obtain sensor output having high signal - to - noise ratio . the tuning - fork type vibration gyro includes a tuning - fork type vibration body having two arms mutually disposed in parallel and a base for commonly supporting one end of the each arm , wherein a longitudinal direction of the two arms is defined as a z - axis and a perpendicular direction thereto is defined as an x - axis ; driving electrodes respectively formed on the two arms for generating vibration of the two arms in a direction parallel to the x - axis ; detecting electrodes respectively formed on the two arms for detecting electromotive force generated when the tuning - fork type vibration body is rotated around the z - axis ; and dummy electrodes formed on the two arms in respective areas different from the driving electrodes and the detecting electrodes .