Electromechanical transducer element, method of manufacturing the same, liquid droplet discharge head, and liquid droplet discharge device

An electromechanical transducer element comprising:

• a substrate;
• a first electrode formed on the substrate and configured to serve as a common electrode;
• an electromechanical transducer membrane formed on the first electrode;
• a second electrode formed on the electromechanical transducer membrane and configured to serve as an individual electrode;
• a first insulation protection membrane formed on the first electrode and the second electrode and having plural contact holes;
• a third electrode formed so as to be electrically connected to the first electrode through one of the contact holes;
• a fourth electrode formed so as to be electrically connected to the second electrode through one of the contact holes;
• a second insulation protection membrane including a common electrode pad formed on the third electrode and plural individual electrode pads formed on the fourth electrode and in a predetermined line;
• and
• a fifth electrode formed so as to surround a vicinity of one of separated individual electrode pads which are separated from each other by a distance greater than a distance between adjacent individual electrode pads except for the separated individual electrode pads in the predetermined line,
• wherein the fifth electrode is formed on the first insulation protection membrane and is electrically connected to the first electrode through one of the contact holes.