To achieve sufficient miniaturization of an annular vibrator and to cause the same to vibrate in a stable position without obstructing its vibration.

An annular vibrator 1 open to both of the Z-axis ends of a three-dimensional coordinate system and vibrating in the directions of both the X- and Y-axes is supported on a support base 4 located within the X-Y plane, by a plurality of support wires 3 whose legs 3b are connected to the support base 4, the support base 4 being placed on a support stand 6 via a damper material 5 and split into a plurality of base parts 4a.