A process of manufacturing an inkjet head includes forming an electrode part, in which after an electrode is formed on an inner surface of a groove part formed in a substrate of the inkjet head, a smoothed film made of an inorganic material and having an average surface roughness of 0.6 μm or less is formed on a surface of the electrode, and then, an electrode protection film having a thickness of 1.0 μm or more is formed on a surface of the smoothed film; bonding a nozzle plate to an opening end face of a pressure chamber in the groove part by an adhesive after the electrode part is formed; and forming, in the nozzle plate, a nozzle communicating with the pressure chamber by laser machining after the nozzle plate is bonded.