NOVELTY - A functional film (10a) has a gas barrier support (12) of preset adhesive force, organic-inorganic laminated material (28) which has alternate lamination of inorganic layer (14) and organic layer (16), and which is formed on the gas barrier support, adhesion layer (20) stuck to other surface of the gas barrier support, back surface protective film (24) of preset linear expansion coefficient stuck by the adhesion layer, and surface protection film (18) of preset melting point laminated on the organic inorganic laminated material.    USE - Functional film used as protective film of organic electroluminescent device, optical films e.g. light reflection prevention film, filter and gas barrier film e.g. packaging material of foodstuff, electronic component in display apparatuses e.g. optical component, liquid crystal display and organic electroluminescent display, semiconductor devices and solar cell.    ADVANTAGE - The functional film is economically manufactured without damaging inorganic layer during heating.    DETAILED DESCRIPTION - A functional film has a gas barrier support, organic-inorganic laminated material which has alternate lamination of inorganic layer and organic layer, and which is formed on the gas barrier support, adhesion layer stuck to other surface of the gas barrier support, back surface protective film stuck by the adhesion layer, and surface protection film laminated on the organic inorganic laminated material. The retardation value of the gas barrier support is 300 nm or less. The organic-inorganic laminated material has one or more organic layers and 2 or more inorganic layers. The lowest layer of the gas barrier support side, and uppermost layer of surface protection film side are inorganic layers. The difference in linear expansion coefficient of the gas barrier support and back surface protective film is 0-80 ppm/ degrees C. The melting point of the surface protection film is 80-170 degrees C. The adhesive force at 25 degrees C of the gas barrier support and adhesion layer is 0.01-0.15 N/25 mm. The adhesive force at 25 degrees C of the surface protection film and inorganic layer of uppermost layer of the laminated material is 0.02-0.06 N/25 mm. An INDEPENDENT CLAIM is included for manufacture of functional film, which involves sticking adhesion layer on gas barrier support, sticking back surface protective film by adhesion layer on elongate laminated material which has inorganic layer and organic layer, forming composite material of organic layer on surface on the opposite side to the back surface protective film, forming inorganic layer of uppermost layer by vapor growth method on the organic layer of the surface conveying the composite material to a longitudinal direction, and affixing a surface protection film on the inorganic layer of the uppermost layer. Formation of inorganic film and surface protection film sticking process are continuously performed in the environment of same pressure and temperature.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the functional film and state of functional film from which adhesion layer, back surface protective film, and surface protection film are peeled.    Functional film (10a)    Gas barrier support (12)    Inorganic layer (14)    Organic layer (16)    Surface protection film (18)    Adhesion layer (20)    Back surface protective film (24)    Laminated material (26)    Organic inorganic laminated material (28)