Patent ID: 8474318

Claim:
An acceleration sensor comprising an acceleration sensor element including a support frame, a weight movable relative to the support frame when acceleration is applied from an outside, a plurality of flexible beams for connecting the weight and the support frame to support the weight, semiconductor piezoresistance elements provided on the beams near sites where the beams are connected to the weight or the support frame, and wirings connected to the semiconductor piezoresistance elements and provided on the beams, the acceleration sensor element being adapted to detect the acceleration applied from the outside in response to changes in resistance of the semiconductor piezoresistance elements, wherein of the plurality of beams, the beams provided with the semiconductor piezoresistance elements for detecting acceleration in a thickness direction of the beams each have at least one stress damping section, wherein the stress damping section is provided on a portion of the beam which is outside regions of the beam where the semiconductor piezoresistance elements are provided, and the beams is symmetrical with respect to a point of intersection between a length center line of the beam and a width center line of the beam.