NOVELTY - A composite film comprises a first gas barrier film, a second gas barrier film and an adhesive layer (4) between the first gas barrier film and the second gas barrier film. The first and second gas barrier films comprise a substrate film (1), at least one organic layer (2) and at least one inorganic layer (3). The adhesive layer comprises a dry lamination adhesive and a metal alkoxide.    USE - As composite film used in a member for a solar cell (claimed); in sealing devices which deteriorate by water moisture and oxygen; as a front or back sheet for a solar cell device such as single crystal silicon-based solar cell devices, polycrystalline silicon-based solar cell devices, single-junction or tandem-structure amorphous silicon-based solar cell devices, gallium-arsenic, indium-phosphorus or the like III-V Group compound semiconductor-based solar cell devices, cadmium-tellurium or the like II-VI Group compound semiconductor-based solar cell devices, copper/indium/selenium (CIS-based), copper/indium/gallium/selenium (CIGS-based), copper/indium/gallium/selenium/sulfur (CIGSS-based) or the like I-III-VI Group compound semiconductor-based solar cell devices, dye-sensitized solar cell devices, and organic solar cell devices; and in electronic paper, particularly a reflection-type electronic display capable of attaining a high precision and a high contrast.    ADVANTAGE - The composite film has excellent flexibility over time, and it can be preferably used for a device which is used over a long period of time. By unifying the organic-inorganic laminate type gas barrier films through the adhesive layer containing a dry lamination adhesive and a metal alkoxide, the flexibility of the composite film is enhanced in addition that the barrier property of the composite film is enhanced. By adding the metal alkoxide into the adhesive layer, the composite film excellent in flexibility over a long period of time is obtained. Moreover, the composite film maintains its favorable barrier property even when it has been placed in conditions of heat and humidity over a long period of time.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing a composite film involving laminating a first gas barrier film comprising a substrate, at least one organic layer and at least one inorganic layer and a second gas barrier film comprising a substrate, at least one organic layer and at least one inorganic layer through an adhesive layer comprising a dry lamination adhesive and a metal alkoxide, and then curing the adhesive layer.    DESCRIPTION OF DRAWING(S) - The figure shows a preferable example of the composite film.    Substrate film (1)    Organic layer (2)    Inorganic layer (3)    Adhesive layer. (4)