Patent ID: 8037760

Claim:
An inertial sensor comprising: an oscillator that is supported by an elastic supporting member such that the oscillator is floating relative to a base and the oscillator is displaceable along a single axis; and a displacement detection unit that detects a displacement of the oscillator, wherein, an oscillation of the oscillator is a simple harmonic motion along a Z axis, an X axis, a Y axis, and the Z axis of a rectangular coordinate system, serving as reference axes of an oscillation coordinate system for the oscillator, are shifted to provide an x axis, a y axis, and a z axis, serving as reference axes of a new oscillation coordinate system, position coordinates of the oscillator of the x, y, and z axes are determined at at least two points during one period of the oscillator, a difference vector (Δx, Δy, Δz) is calculated on the basis of the position coordinates of the x, y, and z axes determined at the two points, and an angular velocity or an acceleration is obtained using the difference vector.