prepared similarly to the example 1 except only that mgo monocrystalline substrate with 100 plane orientation was used in place of mgo monocrystalline substrate with 110 plane orientation both of the first electrode 5 and the piezoelectric layer 7 oriented along the 001 axis direction in accordance with the 100 plane direction of the substrate 3 similarly to the example 1 a piezoelectric constant d 31 was evaluated the piezoelectric constant d 31 of the piezoelectric layer 7 according to the comparative example 1 is u2212 130 pc n along the 100 axis direction which is in plane the piezoelectric constant d 31 along the 010 axis direction which orthogonal to the 100 axis direction is also u2212 130 pc n this means that the piezoelectric layer 7 according to the comparative example 1 had an in plane isotropic piezoelectric property table 2 shows the relationships between the value of l y l x and the value of h z d z of the actuators according to the comparative example 1 because the piezoelectric property is isotropic in table 2 when the value of l y l x is identical the value of h z d z was greater than that of table 1 for this reason the upper limit value of l y l x which satisfies that the value of h z d z is less than.