| abstract |
A piezoelectric element including a first electrode provided above a base body, a first piezoelectric layer provided so as to be in contact with the base body and cover the first electrode, a second piezoelectric layer provided above the first piezoelectric layer, and a second electrode provided above the second piezoelectric layer, wherein the first piezoelectric layer includes a composite oxide that contains potassium and niobium and that has a perovskite-type structure containing potassium as a main component at an A-site, the second piezoelectric layer includes a composite oxide that contains potassium, sodium, and niobium and that has a perovskite-type structure, and the first piezoelectric layer has a higher potassium atomic concentration (atm %) than the second piezoelectric layer. |