Method of manufacturing a liquid ejection head

A method of manufacturing a liquid ejection head, the liquid ejection head including a substrate and an ejection orifice member, which is formed on a first surface of the substrate, and has an ejection orifice surface having formed therein ejection orifices,

• the method comprising:
• preparing the substrate including, on the first surface, the ejection orifice member having the ejection orifice surface having formed therein the ejection orifices, and a supply port opened on a second surface on a side opposite to the first surface of the substrate, the ejection orifices and the supply port communicating with each other in the substrate;
• forming, on the ejection orifice surface, a film having communicating holes for allowing the ejection orifices to communicate to outside;
• closing an opening of the supply port on the second surface with a dry film;
• and
• forming a flow path member by patterning the dry film by irradiating the dry film with light,
• wherein, in the forming of the flow path member, the film having the communicating holes is present on the ejection orifice surface.