Piezoelectric element including a piezoelectric element body, an external electrode and an internal electrode

A piezoelectric element comprising:

• a piezoelectric body;
• an external electrode disposed on an outer surface of the piezoelectric body;
• and
• an internal electrode connected to the external electrode and disposed in the piezoelectric body,
• wherein the internal electrode includes a first internal conductor and a second internal conductor opposing each other,
• the first internal conductor includes a first conductor portion and a second conductor portion continuous with each other,
• the second internal conductor includes:
• a third conductor portion opposing the first conductor portion in a direction where the first internal conductor and the second internal conductor oppose each other;
• and
• a fourth conductor portion including a first region connected to the second conductor portion and a second region continuous with the first region and continuous with the third conductor portion,
• the piezoelectric body includes a body portion located between the first internal conductor and the second internal conductor and formed with a through hole penetrating the body portion in the direction,
• the fourth conductor portion is located in the through hole and has a thickness increasing toward a center line of the through hole,
• the direction includes a first direction from the first internal conductor toward the second internal conductor and a second direction from the second internal conductor toward the first internal conductor,
• the second region includes a region portion having a thickness in the first direction from a reference plane orthogonal to the direction and including the third conductor portion, and a region portion having a thickness in the second direction from the reference plane, and
• a thickness of each of the region portions included in the second region in the direction increases toward the center line.