Patent ID: 8122766

Claim:
An inertial force sensor comprising: a detecting element that detects an inertial force, the detecting element including: two first orthogonal arms, each of the two first orthogonal arms having a first arm and a second arm that are connected to each other in a substantially orthogonal direction; a support portion that supports the two first arms; a fixing arm having one end connected to the support portion and the other end to which a mounting substrate having the detecting element mounted thereon is fixed, at least a portion of the fixing arm serving as the first arm, each of the two first orthogonal arms having the fixing arm; and a weight that is formed at an end of the second arm, and wherein the second arm includes: a bent portion where the second arm is bent; a facing portion formed by bending the second arm at the bent portion, the facing portion being located between the weights and the bent portion; driving electrodes that are formed at two of the facing portions provided in a same direction with reference to the support portion, and drive and vibrate the two facing portions; and detection electrodes that are formed at another two of the facing portions which are opposite to the two facing portions having the driving electrodes with reference to the support portion, and detect distortion of the another two facing portions.