Method for manufacturing inkjet recording head of inkjet recording device

A method for manufacturing an inkjet recording head including a plurality of nozzles and a plurality of piezoelectric elements provided in one-to-one correspondence with the plurality of nozzles, each piezoelectric element expanding and contracting in accordance with a driving voltage applied thereto and polarizing during manufacturing in accordance with a polarizing voltage applied to thereto, the method comprising:

• ejecting test ink droplets and print ink droplets from the nozzles;
• measuring ejection results of the test ink droplets;
• dividing the plurality of nozzles into a plurality of groups based on the ejection results;
• and
• applying a group-based polarizing voltage determined for each group to the piezoelectric elements belonging to a corresponding group to polarize the piezoelectric elements so that ejection results of the print ink droplets fall in a predetermined range.