To allow downsizing and thinning by setting vibration tracks of a vibration mass gravity center approximately linear so as to cancel vibration inertia force and providing an excitation electrode on a surface in a bending shape, when a plurality of vibration legs freely vibrate.

Vibration legs 1R, 1L are respectively directed to free ends 4R, 4L from fixed ends 2R, 2L and partitioned with spring portions 31R, 31L, 33R, 33L for each bent portions, excitation electrodes 6R, 6L are provided on peripheral 4 surfaces of the spring portions 31R, 31L. A vibrating body is made to hypothetically freely vibrate, and a shape or the like is set so that total of inertia forces at respective detail parts calculated in a finite element method are cancelled vertically and reversely to a symmetric shaft SA. When the vibrating body rotates in a surface, Coriolis forces FR, FL act to gravity centers GR, GL of added masses of the vibration legs 1R, 1L, and lines of action become moving diameters rR, rL. Because axial lines of the spring portions 33R, 33L are far from a center of rotation, distances of the moving diameters rR, rL are longer, large Coriolis forces are applied to the entire length, and high sensitive detection is allowed.