To keep the flight of an ink drop stably by manufacturing a nozzle base through a process for subjecting the other side thereof to water repellent processing using a part of a coating projecting from a nozzle hole as a mask thereby reducing the manufacturing process.

A dry film 14 is preheated at about 80°C by means of a heater 17. A nozzle member 15 is held, for about 50 sec, under a state where the vacuum pressure in a vacuum chamber 19 is reduced to about -70 cmHg. The dry film 14 is softened through heating and drawn out to the ejection surface F through vacuum suction. A part of the dry film 14 thus drawn out forms a spherical protrusion having diameter of about 38 μm at the front part of a nozzle hole 11 through action of surface tension. Surface of a nozzle member 15 is then subjected to water repellent processing by fluorine based eutectoid plating using the spherical protrusion as a mask and the dry film 14 is stripped. Consequently, a water repellent layer is provided on the ejection surface F of the nozzle member 15 and a nozzle base is produced.