Liquid ejection head and inkjet recording apparatus

A liquid ejection head comprising:

• a channel member including a liquid channel;
• an ejection substrate disposed on a bottom surface of a recess disposed in the channel member, the ejection substrate including a nozzle row having a plurality of nozzles communicating with the liquid channel, the nozzles being arranged in a first direction;
• and
• a sealing member having a thermosetting resin filled in a predetermined space within a space defined by a side surface of the recess, the bottom surface of the recess, and a side surface of the ejection substrate, the predetermined space being located upstream of the ejection substrate with respect to a second direction intersecting with the first direction, wherein
• the sealing member includes:
• a first sealing portion having a first resin located near the bottom surface within the predetermined space;
• a second sealing portion having a second resin located near an ejection surface of the ejection substrate within the predetermined space, the ejection surface being a surface provided with the nozzles, and the second sealing portion being in contact with the side surface of the ejection substrate;
• and
• a third sealing portion having a third resin located near the ejection surface of the ejection substrate within the predetermined space, the third sealing portion being in contact with the side surface of the recess,
• a coefficient of linear expansion of the first resin is less than a coefficient of linear expansion of the second resin and a coefficient of linear expansion of the third resin, and
• a specific gravity of the first resin is greater than a specific gravity of the second resin and a specific gravity of the third resin.