Liquid ejection head

A liquid ejection head, comprising:

• a printing element substrate including an ejection surface provided with a first ejection orifice array and a second ejection orifice array, each including a plurality of ejection orifices configured to eject a liquid, the first ejection orifice array and the second ejection orifice array being arranged relative to one another in a direction intersecting with an array direction in which the ejection orifices of the first ejection orifice array are arrayed;
• and
• a protective member provided with a first opening corresponding to the first ejection orifice array and a second opening corresponding to the second ejection orifice array, wherein
• the protective member is arranged adjacent to the ejection surface of the printing element substrate via an adhesive arranged between the first ejection orifice array and the second ejection orifice array,
• wherein a recessed part is formed on the ejection surface and the adhesive is applied to the recessed part, and
• wherein the recessed part is formed so as to enclose each of the first ejection orifice array and the second ejection orifice array.