Patent ID: 8079675

Claim:
A manufacturing method of an ink jet recording head including a substrate provided with energy generating elements to generate energy used for discharging ink, discharge ports from which the ink is discharged, a supply port formed in the substrate for supplying the ink, and ink paths formed on the substrate to make the discharge ports and the supply port communicate with each other, said method comprising the steps of: forming shapes of the ink paths on the substrate with a soluble material; coating the shapes with an inorganic material to form a coated layer to be wall members of the ink paths; forming an undercoat layer for performing plating so as to cover the coated layer after performing said step of forming the coated layer; plating using the undercoat layer to form metal between the wall members of adjoining ink paths; forming the discharge ports in the coated layer; forming supply ports in the substrate; removing the undercoat layer on the shapes; and removing the shapes.