Patent ID: 8729967

Claim:
A surface-mounted crystal oscillator which has a crystal piece mounted on a substrate which is a rectangular ceramic substrate, comprising: first and second support electrodes which hold the crystal piece; through terminals which are formed on wall surfaces of through holes formed at corner portions of the substrate; first and second lower layer portions which are formed in lower layers of the first and second support electrodes on a front side of the substrate; a first connection terminal which connects an end portion of the first lower layer portion to the through terminal at the corner portion that is the closest to the end portion; a second connection terminal which connects an end portion of the second lower layer portion to the through terminal at the corner portion that is the closest to the end portion; and a cover which covers and airtightly seals the crystal piece, wherein the through terminals, the lower layer portions, and the connection terminals are formed of an antioxidant metal film, and the first and second support electrodes are formed by using silver.