Piezoelectric vibration element, piezoelectric vibration device, and portable terminal

A piezoelectric vibration element, comprising:

• a plurality of piezoelectric layers;
• and
• a plurality of electrode layers, the plurality of piezoelectric layers and the plurality of electrode layers being stacked along a height direction,
• the piezoelectric vibration element having a shape including a first surface and a second surface both of which face each other so as to be at intervals in the height direction, a third surface and a fourth surface both of which face each other so as to be at intervals in a length direction, and a fifth surface and a sixth surface both of which face each other so as to be at intervals in a width direction,
• the piezoelectric vibration element having a dimension in the width direction, a dimension in the height direction, and a dimension in the length direction that is larger than the dimension in the width direction and is larger than the dimension in the height direction,
• the first surface having such a shape that a central portion thereof in the width direction protrudes as compared with opposite end portions thereof in the width direction.