Patent ID: 7378780

Claim:
A surface mount type crystal oscillator, comprising: a container body composed of a laminated ceramic including a planar center layer, first frame layer, and second frame layer, the first and second frame layers each having an opening and stacked on opposite surfaces of the center layer respectively; a pair of crystal retaining terminals provided on a bottom surface of a first recess formed by the center layer and the first frame layer; a crystal blank fixed to the crystal retaining terminals and hermetically sealed in the first recess to constitute a crystal unit; a circuit terminal provided on a bottom surface of a second recess formed by the center layer and the second frame layer; an IC chip into which an oscillation circuit using the crystal unit is integrated, the IC chip including an IC terminal corresponding to the circuit terminal, the IC chip fixed to the bottom of the second recess by the IC terminal bonded to the circuit terminal; and a test terminal provided on an outer side surface of the container body and used to test the crystal unit, wherein the circuit terminal includes a crystal circuit terminal, the center layer has at least a first layer and a second layer, the crystal retaining terminal is electrically connected to the crystal circuit terminal through first via-hole provided in the first layer and second via-hole provided in the second layer, and the crystal retaining terminal is electrically connected to the test terminal through the first via-hole and a conductive path provided on an interface between the first layer and the second layer.