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Technical Examples
The present invention provides a cheap angular velocity sensor capable of detecting angular velocity with high precision by using a vibration mode which cannot be set by external vibration. The angular velocity sensor includes: a vibrator (2) formed as a solid of revolution and made of a magnetostrictive material; a supporter (3) disposed on an axis of the vibrator (2) and supporting the vibrator (2) at a position where the axis crosses the surface of the vibrator (2); an excitation coil (4) for generating a magnetic field along a radial direction around the axis as a center in the vibrator (2), thereby making the vibrator (2) vibrate in the radial direction; a detection coil (6) which is disposed apart from the vibrator (2) and detects a magnetic flux change caused by a change in the vibration of the vibrator (2) which occurs depending on angular velocity.