Piezoelectric vibration element, piezoelectric vibrator, piezoelectric oscillator, and electronic device

A piezoelectric vibration element comprising:

• a piezoelectric substrate;
• excitation electrodes that are arranged so as to face each other on both principal faces of the piezoelectric substrate;
• drawn-out electrodes that extend from the excitation electrodes toward one end portion of the piezoelectric substrate;
• and
• pads that are electrically connected to the drawn-out electrodes and are formed on two corner portions of the piezoelectric substrate,
• wherein the piezoelectric substrate includes an excitation portion that is located at the center and a peripheral portion that is thin-walled to be thinner than the thickness of the excitation portion and is disposed on a peripheral edge of the excitation portion,
• wherein two side faces of the excitation portion that face each other are planes having no level difference, and the other two side faces of the excitation portion that face each other have level difference portions in a thickness direction,
• wherein support areas that fix the piezoelectric substrate to a support member are included at positions of the piezoelectric substrate corresponding to the pads of the corner portions, and
• wherein the excitation electrodes are formed over the excitation portion and a vibration area that is at least a part of the peripheral portion.