A liquid ejection head includes: 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. The recessed portions include pairs each constituted by two recessed portions located side by side and at least one of which has the ejection openings. 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 another pair.