Method for producing liquid-ejection head

A liquid-ejection head comprising:

• a substrate on or above which a plurality of actuators are formed, the plurality of actuators generating energy for ejecting a liquid;
• and
• a flow-passage-forming member on or above the substrate, the flow-passage-forming member defining ejection ports through which the liquid is ejected and a plurality of liquid chambers each having a corresponding one of the plurality of actuators,
• the flow-passage-forming member including an orifice plate defining the ejection ports and liquid-chamber side walls defining side walls of the plurality of liquid chambers,
• the flow-passage-forming member being formed of an inorganic material and having a depressed portion between the liquid chambers, and the depressed portion being filled with a photosensitive resin,
• wherein pinholes are formed in the photosensitive resin filled in the depressed portion, and
• wherein the area of the cross section of a pinhole of the pinholes parallel to the substrate is 1/10 or less of that of the ejection port.