Patent ID: 7936114

Claim:
A piezoelectric vibrator comprising: a base substrate, a lid substrate in which cavity recesses are formed and which is bonded to the base substrate in such a state that the recesses face the base substrate, a piezoelectric vibration member bonded to the upper face of the base substrate in such a state that it is housed in the cavity formed of the recess between the base substrate and the lid substrate, an external electrode formed on the lower face of the base substrate, a through-electrode formed in the through-electrode formed in the base substrate in such a state that it is electrically connected with the external electrode with keeping the airtightness inside the cavity, and a routing electrode formed on the upper face of the base substrate to electrically connect the piezoelectric vibration member and the through-electrode; wherein the through-electrode is composed of: an electroconductive core part inserted into the through-hole, and a cylindrical body formed by mixing a glass frit and a granular material having a higher hardness than that of the glass frit followed by filling the mixture into the space between the through-hole and the core part.