Provided is a method for producing a film with which defects attributed to application irregularities are not produced in the film and, when a porous film is used as the applied film, a film maintaining sufficient air permeability can be obtained. Also provided is a method for storing an application liquid. In the method for producing a film and method for storing an application liquid, an application liquid formed from a composition comprising an aromatic polymer, inorganic particles, and a solvent is stirred at a stirring member peripheral speed of 0.05 m/second to 2.0 m/second.