Patent ID: 8207654

Claim:
A piezoelectric vibrator comprising: a piezoelectric vibrating piece responsive to application of voltage to vibrate; a shell made of a first material which forms at least a part of a container hermetically enclosing the piezoelectric vibrating pieces; and a through electrode arranged in a through hole formed in the shell and electrically connecting the piezoelectric vibrating piece with an external electrode mounted on an undersurface of the shell, the through electrode comprising: a filler made of a second material which fills the through hole formed in the shell; and a conductive core made of a third material going through the filler in the through hole for applying the voltage to the piezoelectric vibrating piece, wherein a thermal expansion coefficient of the first material is equal to or larger than a thermal expansion coefficient of the second material, which is larger than a thermal expansion coefficient of the third material; wherein the conductive core is formed to have substantially the same thickness as a thickness of the through hole formed in the shell; wherein the filler secures the conductive core in the through hole.