u201c b u201d is a vertical sectional view thereof at the line a a in the plan view u201c a u201d fig1 is a plan view of the completed ink jet recording head shown in fig1 a and 17b in fig1 the nozzle layer is not shown referring to fig1 a 18 the ink jet recording head manufactured with the use of the ink jet recording head manufacturing method in this embodiment has a substrate 1 on which a plurality of heaters electro thermal transducer elements 110 as ejection pressure generation elements for heating the ink liquid to generate ink liquid ejection pressure by generating bubbles in the ink liquid are formed although there are also formed on the substrate 1 a semiconductor circuit inclusive of transistors or the like for driving the heaters 110 and electrical pads for maintaining electrical connection between the recording head and the main assembly of a recording apparatus these are not shown in order to make the drawings easier to understand the substrate 1 is provided with an ink supply hole 109 which is a through hole the heaters 110 are disposed in two lines along the edges of the ink supply hole 109 on the obverse side of the substrate although only three heaters 110 are shown in the drawings in order to make it easier to understand the drawings the ink jet recording head.