Piezoelectric device and method for fabricating the same, and ink jet printer head and method for fabricating the same

An ink jet printer head comprising:

• a piezoelectric device comprising an insulating substrate and a plurality of displacement layers stacked on the insulating substrate, each of the displacement layers including a common first electrode, a piezoelectric layer and a plurality of second electrodes laid one on the other in the stated order,
• wherein a part of a surface of the piezoelectric device in a region where the first and the second electrodes overlap each other is projected out of the rest of the surface of the piezoelectric device more than a thickness of the second electrode;
• a wafer formed on the plurality of displacement layers of the piezoelectric device and having, on the second electrodes, a plurality of openings which act as pressure chambers;
• an insulation plate formed on the wafer;
• and
• a high rigidity plate provided on a vertical side wall of the piezoelectric device, the wafer and the insulation plate for securing the piezoelectric device.