Liquid ejection head and liquid ejection apparatus

A liquid ejection head comprising:

• a nozzle forming member having a group of nozzles composed of a plurality of nozzles that are arranged in rows in a first direction;
• a pressure generating unit having a pressure chamber forming substrate in which a plurality of pressure chambers that correspond to the plurality of nozzles are formed, a plurality of pressure generating sections that are formed to correspond to the pressure chambers, and a protective substrate that is connected to the pressure chamber forming substrate with the pressure generating sections being housed therein;
• a communication plate in which a first liquid chamber that communicate with the plurality of pressure chambers is formed;
• and a case member to which the pressure generating unit and the communication plate are fixedly attached, wherein a plurality of the first liquid chambers separated from each other are provided in the first direction and the first liquid chamber communicates with the pressure chamber through an opening in the thickness direction of the communication plate;
• and a gap between the case member and the pressure generating unit is sealed with an adhesive and the opening of the first liquid chamber on the side of the case member is sealed by using the adhesive.