Patent ID: 7061164

Claim:
In a crystal oscillator provided with a crystal element; a main surface electrode configured of a first underlayer formed on each of two main surfaces of said crystal element and a first surface layer of Au superimposed over said first underlayer; an end surface electrode having a second underlayer formed on said crystal element to extend over said main surface electrode and a second surface layer of Au superimposed to cover said second underlayer; a supporter for holding said crystal element in the horizontal direction, bonded to said end surface electrode by a eutectic alloy comprising at least Au; and a base on which said supporter stands, a crystal oscillator wherein an intermediate layer is provided between said second underlayer and said second surface layer of said end surface electrode; said intermediate layer protrudes further towards the center over said main surface electrode than said second surface layer; and also said intermediate layer is formed of a metal having the characteristic of increasing the adhesive strength between said underlayer and said second surface layer, as well as that of said eutectic alloy.