A piezoelectric oscillation element (1) comprising a piezoelectric
substrate (10), a first conductor film (21) formed on one main surface of
the piezoelectric substrate (10), a second conductor film (22) formed on
the other main surface, and grounding terminals (31a, 31b) formed on the
side surfaces of the piezoelectric substrate (10). Specified capacitances
are respectively formed between the first and second conductor films (21,
22) formed on the main surfaces of the piezoelectric substrate (10) and
the grounding terminals (31a, 31b) formed on the side surfaces thereof.
Larger capacitances can be formed than when electrodes are disposed on
the same main surface in proximity of each other to form a capacitance,
whereby no adverse effect is given to thickness vibration occurring
between the first and second conductor films (21, 22).