Method for manufacturing ink jet recording head

A method for manufacturing an ink jet recording head in which a plurality of recording element substrates used for discharging ink are arranged onto a support substrate, the method at least comprising:

• measuring heights of a main surface of the support substrate at least at three measurement points;
• setting a reference surface that passes through two measurement points of the main surface out of the measurement points;
• acquiring a distance from the measurement point that is not included in the two measurement points on the reference surface to the reference surface;
• calculating amounts of deviation of landing that are differences between positions at which lines extending from the recording element substrates in a direction perpendicular to the reference surface intersect a recording medium and positions at which lines extending in directions to which ink discharge ports of the recording element substrates are directed intersects the recording medium when it is assumed that the recording element substrates are arranged in a plurality of arrangement portions disposed on the support substrate, and the recording medium is arranged at a position separated from the reference surface by a predetermined distance so as to be parallel to the reference surface;
• and
• determining arrangement positions of the recording element substrates on the support substrate by correcting the positions of the arrangement portions according to the amounts of deviation of landing.