To easily detect the direction and magnitude of acceleration, and the center and magnitude of the rotation of angular acceleration with high accuracy, without always supplying (consuming) power.

The acceleration sensor and angular acceleration sensor have a structure like a wheel, where three equiangular arms (A11(A12), A21(A22), A31(A32)) are constituted by crystal pieces cut in rectangular shape, to the Z axis and are spread about an added weight, and each outer end is connected to a circular ring. The acceleration sensor and angular acceleration sensor have electrodes (P11, P12) (P13, P14, P15, P16), arranged so as to detect voltage generation by extension displacement, compression displacement, or flexion displacement of each crystal arm, constituting a spoke between the center weight (B11 (B12)) and the outer end. The acceleration sensor and angular acceleration sensor detect the direction and magnitude of the accelerations (G12, G13, G14) and angular acceleration (G15) applied to this structure from the outside, based on the voltage information of the electrodes.

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