Patent ID: 7501746

Claim:
A piezoelectric oscillator, comprising: a package including: a first recessed portion formed on a first surface; a second recessed portion formed on a second surface with at least a part of a side surface being open, and a conductor wired from at least one of an inside surface of the first recessed portion and an inside surface of the second recessed portion to an outside surface; a piezoelectric element accommodated in the first recessed portion; a lid being in contact with the first surface and air-tightly sealing the first recessed portion; a circuit element accommodated in the second recessed portion and connected with the conductor; a resin portion formed in the second recessed portion to cover the circuit element; and an electrical check terminal connected with the conductor of the package, wherein the electrical check terminal is formed on a surface of the resin portion with a conductive paste or conductive ink.