An angular rate sensor includes a quadratic prism-like oscillator 1a
formed by laminating a substrate 2 and a piezoelectric material 3, the
piezoelectric material 3 is made of piezoelectric ceramics including PZT
(Lead Zirconate Titanate) as a main component, and the substrate 2 is
made of a material other than PZT having physical property values
equivalent to or less than PZT, which is a main component of the
piezoelectric ceramics, with respect to Young's modulus, thermal
expansion coefficient, and the like.