Patent ID: 8268539

Claim:
A method of manufacturing a liquid ejection head, the liquid ejection head comprising: a substrate having on a first surface side thereof an ejection energy generating element for generating energy for ejecting a liquid droplet; a flow path forming member formed on the first surface and constituting an ejection orifice for ejecting the liquid droplet therefrom and a liquid flow path for supplying liquid to the ejection orifice; and a fluid resistance portion on a wall surface of the liquid flow path opposed to the substrate, the method comprising: (1) forming on the first surface of the substrate a flow path pattern to be a mold material of the liquid flow path; (2) forming on the flow path pattern a negative organic resin layer to be the flow path forming member; (3) exposing the negative organic resin layer except for regions in which the ejection orifice and the fluid resistance portion are to be formed, respectively, and heating the negative organic resin layer and the flow path pattern to move a portion of the negative organic resin layer which corresponds to the fluid resistance portion toward the substrate; (4) forming the ejection orifice by exposing and developing the region of the negative organic resin layer in which the fluid resistance portion is to be formed; and (5) removing the flow path pattern.