| 摘要 |
A liquid ejection head including: a plate base material; and an actuator; wherein the plate base material has: ejection holes having recessed portions; and an ejection face having ejection openings; wherein the recessed portions include pairs thereof each constituted by two recessed portions located side by side and at least one of which has the ejection openings; wherein, where a shortest line segment of a certain pair is equal to or shorter than that of another pair, an average value of lengths of the respective recessed portions constituting the certain pair is not larger than that of lengths of the respective recessed portions constituting said another pair; and wherein a liquid repellent layer is formed on the bottom portion of the recessed portion having the ejection openings, wherein the liquid repellent layer formed on the bottom portion is a layer having not been removed due to a masking material having entered into the recessed portion and covered the liquid repellent layer.
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