Provided are a barrier film production method and a barrier film comprising at least one organic layer and two or more inorganic layers on a surface of a plastic film, wherein, under an atmosphere of at least 0.3 atmospheric pressure and at most 1.1 atmospheric pressure (1 atmospheric pressure is 1.01325×105 Pa), an organic layer coating liquid is applied on at least one surface of the plastic film, and dried to form the organic layer, thereafter, an inorganic layer coating liquid containing an inorganic compound is applied and dried on the organic layer to laminate at least 2 to 6 inorganic layers, and thereafter, at least two layers of the laminated inorganic layers are subjected to a conversion process.