Patent ID: 7290449

Claim:
A physical quantity sensor comprising: a substrate; an angular speed sensor disposed on the substrate; and an acceleration sensor disposed on the substrate, wherein the angular speed sensor includes an oscillator capable of oscillating by a driving force and displaceable in accordance with a Coriolis force attributed to an angular speed of to oscillator, the acceleration sensor includes a movable portion displaceable in accordance with an acceleration of the acceleration sensor, and the oscillator has a driving direction, which is not parallel to a displacement direction of the movable portion, the oscillator of the annular speed sensor has a resonant frequency in the driving direction, the acceleration sensor is disposed on the substrate through an adhesive layer, the adhesive layer of the acceleration sensor has another resonant frequency, and the resonant frequency of the oscillator in the driving direction is greater than or equal to square root of two times the resonant frequency of the adhesive layer in the displacement direction.