| abstract |
A piezoelectric body (piezoelectric layer 14 ) is configured to include a first piezoelectric layer 14 a , a second piezoelectric layer 14 b , and a third piezoelectric layer 14 c . A piezoelectric constant of each of the first and third piezoelectric layer 14 a and 14 c is set to be smaller than that of the second piezoelectric layer 14 b . Thus, it is possible to reduce an internal stress generated at an interface between first and second electrode layers 13 and 15 corresponding to the first and third piezoelectric layer 14 a and 14 c , and generation of a crack caused by high voltage application or driving performed for a long time is expected to be greatly reduced. |