Liquid ejection head and method for manufacturing the same

A method for manufacturing a liquid ejection head including a substrate including an energy generating element configured to generate energy used for ejecting liquid, a flow channel member overlying the substrate and defining a flow channel through which a liquid is supplied, and an ejection opening member overlying the flow channel member and defining an ejection opening through which the liquid supplied through the flow channel is ejected by the energy from the energy generating element, the method comprising:

• (1) forming a layer of a photosensitive resin composition containing a multifunctional epoxy resin and a polyhydric alcohol having a perfluoroalkyl group in the molecule thereof for the flow channel member over a substrate;
• (2) forming a latent image including a flow channel pattern in the layer of the photosensitive resin composition by exposure the pattern;
• (3) developing the latent image to form a flow channel;
• (4) forming a layer of an ejection opening member material over the layer of the photosensitive resin composition;
• and
• (5) forming an ejection opening in the layer of the ejection opening member material to yield the ejection opening member,
• wherein the layer of the photosensitive resin composition has a first surface adjacent to the substrate and a second surface opposite the first surface, and the polyhydric alcohol in the photosensitive resin composition has a lower concentration on a side toward the first surface side than on a side toward the second surface.