Abstract: A torsional resonator for suppressing unnecessary flexural vibration and providing excellent resonance characteristic is provided. A vibrator is a beam structure or a paddle-like projection structure added onto a beam structure and an electrostatic force produced due to the potential difference between an electrode and the vibrator adds a moment with the axis of the beam of the vibrator as the center axis, but does not add a force for producing flexure to the beam. As one method, the same AC signal and DC bias voltages different in polarity are applied to an electrode pair of the electrode brought away from the vibrator and the electrode brought close to the vibrator with torsional vibration of the vibrator, so that only torsional vibration can be excited.