The present invention provides a process for producing a liquid ejection head, the process including: (1) forming a mold pattern of a liquid flow path and a base pattern surrounding the mold pattern on a substrate, (2) disposing a covering layer to cover the mold pattern and the base pattern, (3) forming at least an ejection orifice in the covering layer to form an orifice plate, and (4) removing the mold pattern and the base pattern, in which the base pattern has such a form that the orifice plate is formed to have a side wall portion constituting a side wall of the liquid flow path and a plurality of support structures that are disposed on the substrate in a peripheral region of the side wall portion and support an upper surface portion constituting an upper wall of the orifice plate.