Provided is a method for manufacturing an element substrate for use in a liquid ejection head for ejecting a liquid to a recording medium. The element substrate, includes: a substrate having a nozzle including an ejection port, and a pressure generating chamber communicating with the nozzle, and subjected to a liquid repellent treatment on a part of a surface on a side opposed to the recording medium; and a generating element for generating an energy for ejecting the liquid. The method for manufacturing an element substrate includes: a liquid repellent treatment step of performing the liquid repellent treatment on the substrate; and a liquid repellent region removing step of removing a part of a liquid repellent region subjected to the liquid repellent treatment so that a non-liquid repellent region not subjected to the liquid repellent treatment is exposed at a surface of the substrate opposed to the recording medium.

Provided is a method for manufacturing an element substrate for use in a liquid ejection head for ejecting a liquid to a recording medium. The element substrate, includes: a substrate having a nozzle including an ejection port, and a pressure generating chamber communicating with the nozzle, and subjected to a liquid repellent treatment on a part of a surface on a side opposed to the recording medium; and a generating element for generating an energy for ejecting the liquid. The method for manufacturing an element substrate includes: a liquid repellent treatment step of performing the liquid repellent treatment on the substrate; and a liquid repellent region removing step of removing a part of a liquid repellent region subjected to the liquid repellent treatment so that a non-liquid repellent region not subjected to the liquid repellent treatment is exposed at a surface of the substrate opposed to the recording medium.