NOVELTY - Manufacturing (M1) organic/inorganic laminate comprises: (a) forming first organic layer by laminating and hardening a composition for a first organic layer containing acidic compound which is a polymerizable acidic compound, oligomer or polymer, polymerizable compound, and silane coupling agent, on a first inorganic layer; and (b) forming second organic layer by laminating and hardening a composition for second organic layer containing polymerizable compound and (meth)acrylate having an aromatic group on first organic layer or on at least one organic layer disposed on first organic layer.    USE - The method is useful for manufacturing organic/inorganic laminate (which is a barrier laminate) which is useful in a gas barrier film or a device including a solar battery or an organic electroluminescent device (all claimed).    ADVANTAGE - The method provides organic/inorganic laminates having good surface smoothness, and improved adhesion between each of the layers, bending resistance and barrier property.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) manufacturing organic/inorganic laminate comprising steps (a) and (b) as above per se, and forming a second inorganic layer on the second organic layer;    (2) the organic/inorganic laminate manufactured by the method (M1);    (3) an organic/inorganic laminate in which the first inorganic layer and second organic layer are laminated in an order where at least one organic layer is laminated between the first organic layer and the second organic layer, where acidic groups and siloxane bonds are contained in the first organic layer, an M-O-Si bond or M'-O-Si bond is formed between a metal atom M or M' constituting the first or second inorganic layer and an Si atom containing the first or second organic layer, respectively, aromatic ring structures and siloxane bonds are contained in the second organic layer, and the acid value of the first organic layer is greater than the acid value of the second organic layer;    (4) a gas barrier film in which the organic/inorganic laminate is formed on a base film; and    (5) a device using the gas barrier film as a substrate.