Patent ID: 7845070

Claim:
A manufacturing method of an ink jet head that has: a plurality of laminated flow path plates in which a flow path hole is formed in each of them; and a nozzle plate laminated on said flow path plate located at the outermost position, wherein a nozzle hole which is linked to said flow path hole and discharges an ink supplied from said flow path hole is formed in said nozzle plate, comprising: a flow path hole forming step of forming said flow path holes on first plates to be said flow path plates, respectively; a first laminating step of laminating one flow path plate of said plurality of flow path plates on which said flow path hole is formed at said flow path hole forming step and a second plate to be said nozzle plate to each other; a second laminating step of laminating a protective film to said second plate; a third laminating step of laminating each of said plurality of flow path plates on which said flow path holes are formed at said flow path hole forming step to each other; a nozzle hole forming step of forming said nozzle hole on a region where the protective film is laminated, in said second plate to which the protective film is laminated at said second laminating step; and a film removing step of removing said protective film from said nozzle plate, after the first through third steps.