To provide a method for stably manufacturing a gas barrier film having high gas barrier properties without causing irregularity by improving coating properties and adhesion at the time when a coating type barrier layer is formed on a base material or film containing an organic resin component, the gas barrier film, and an organic photoelectric conversion element having the gas barrier film.

In the method for manufacturing the gas barrier film by forming at least one gas barrier layer on the base material or film containing the organic resin component by coating the surface of the base material or film with a silicon compound-containing solution, a process for performing coating property enhancing treatment with respect to the surface of the base material or film containing the organic resin component is provided before the surface of the base material or film is coated with the silicon compound-containing solution and, before the coating property enhancing treatment, simultaneously with the coating property enhancing treatment or after the coating property enhancing treatment, the base material or film is heated.

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