| 摘要 |
Disclosed is a piezoelectric device mounted on a mount board, including: a piezoelectric vibrating piece having an excitation electrode and an extraction electrode extracted from the excitation electrode; and a base plate made of an insulative material, the base plate having a first face where the piezoelectric vibrating piece is placed and a second face opposite to the first face, where an external electrode is provided, wherein at least a part of an area other than the external electrode of the second face is hollowed to the first face side to form a cavity in the second face side for the mount board when the piezoelectric device is mounted on the mount board. |
