PURPOSE: To provide an energy confinement type piezoelectric resonator utilizing a shear vibration mode in which the energy confinement efficiency is enhanced by forming a vibration absorption part to a piezoelectric substrate part between a vibration part and a piezoelectric substrate end face so as to surely prevent leakage of a vibration energy of the vibration part to the end of the piezoelectric substrate.

CONSTITUTION: Grooves 15a, 15b extended in the broadwise direction are formed between a vibration part and an end face 12b on an upper side of a piezoelectric substrate 12. Similarly grooves 16a, 16b extended in the broadwise direction are formed between a vibration electrode and an end face 12a on a lower side of the piezoelectric substrate 12. Vibration absorption parts 17, 18 are formed respectively between the grooves 15a and 15b and between the grooves 16a and 16b by forming the grooves 15a, 15b, 16a, 16b to a piezoelectric resonator 11 in this way. Thus, vibration not confined in the vibration part, that is, vibration leaked from the vibration part in the directions of the end faces 12a, 12b of the piezoelectric substrate 12 is sufficiently attenuated by the vibration absorption parts 17, 18 and then the vibration energy is surely confined in the regions.