Liquid ejection head, liquid ejection apparatus, and method of attaching liquid ejection head

A page-wide liquid ejection head configured to be removably installed in a main body of a liquid ejection apparatus, the liquid ejection head comprising:

• a connection part for liquid through which a liquid is supplied from the main body;
• a sub tank as a negative pressure generation means connected to the connection part for liquid;
• and
• an electrical connector through which an electric signal is supplied from the main body,
• wherein
• a circulation pathway is formed between the main body of the liquid ejection apparatus and the liquid ejection head and when the liquid ejection head is installed in the main body of the liquid ejection apparatus, and
• the connection part for liquid and the electrical connector are located at one side of the liquid ejection head with respect to a longitudinal direction and are provided to face different directions from each other.