Multi-layer piezoelectric ceramic component-mounted piezoelectric device

A piezoelectric device, comprising:

• a vibration member;
• a joint;
• and
• a multi-layer piezoelectric ceramic component mounted to the vibration member via the joint,
• the multi-layer piezoelectric ceramic component including
• a piezoelectric ceramic body
• having a cuboid shape in which a length is larger than a width and the width is larger than a thickness,
• having an upper surface and a lower surface facing each other in a thickness direction, a first end surface and a second end surface facing each other in a length direction, and a pair of side surfaces facing each other in a width direction, and
• including a first region on a side of the upper surface in the thickness direction and a second region on a side of the lower surface in the thickness direction,
• first internal electrodes that are formed in the first region and are drawn to the first end surface,
• second internal electrodes that are formed in the second region and are drawn to the first end surface,
• third internal electrodes that are formed in the first region and the second region and are drawn to the second end surface, the third internal electrodes being laminated alternately with the first internal electrodes in the first region at predetermined distances from the respective first internal electrodes in the thickness direction and being laminated alternately with the second internal electrodes in the second region at predetermined distances from the respective second internal electrodes in the thickness direction,
• a first end surface terminal electrode that is formed on the first end surface and is electrically connected to the first internal electrodes,
• a first surface terminal electrode that is formed on the upper surface and is electrically connected to the first end surface electrodes,
• a second end surface terminal electrode that is formed on the first end surface, is electrically insulated from the first end surface terminal electrode, and is electrically connected to the second internal electrodes,
• a second surface terminal electrode that is formed on the upper surface and is electrically connected to the second end surface electrodes,
• a third end surface terminal electrode that is formed on the second end surface and is electrically connected to the third internal electrodes, and
• a first surface electrode that is formed on the upper surface, is electrically connected to the third end surface terminal electrode, and extends from the second end surface side toward the first surface terminal electrode and the second surface terminal electrode to face and overlap the first internal electrodes as viewed in the thickness direction,
• wherein the first internal electrodes, the second internal electrodes, and the third internal electrodes each having a width equal to a distance between the pair of side surfaces, and
• a region of the upper surface on the first end surface side is joined to the joint.