Piezoelectric actuator and manufacturing method thereof, liquid ejecting head, and image forming apparatus

An image forming apparatus which forms an image on a recording medium, comprising:

• a liquid ejecting head which ejects recording liquid on the recording medium for forming the image on the recording medium,
• wherein the liquid ejecting head includes
• a nozzle that ejects liquid;
• a liquid chamber connected to the nozzle;
• a vibration plate of which at least one wall of the liquid chamber is formed;
• and
• a piezoelectric actuator that deforms the vibration plate,
• wherein a piezoelectric actuator including:
• a base member;
• and
• three or more piezoelectric element members in which a plurality of piezoelectric elements are formed by slits,
• wherein the three or more piezoelectric element members are arrayed in a line on the base member and in a same direction as the plurality of piezoelectric elements are arrayed,
• the three or more piezoelectric element members are arrayed with a gap between two adjacent piezoelectric element members, and
• an index is formed on the base member so that the three or more piezoelectric element members are arrayed with the gap between two adjacent piezoelectric element members.