TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polar functional group (a) of fluororesin (A) is an acid-anhydride residue. The fluororesin (A) is chosen from ethylene/tetrafluoroethylene type copolymer, ethylene/tetrafluoro ethylene/hexafluoropropylene type copolymer and ethylene/tetrafluoroethylene/hexafluoropropylene/CH2=CH-Rf poly functional group (b) of thermoplastic resin (B) is chosen from carbonyl group, hydroxyl group and ether group. The carbonyl group is chosen from group which consists of ester group, acid amide group, acid-imide group, acid halide group, acid-anhydride residue and carboxyl group. Preferred Process: The layer (I) and layer (II) are adhered by heating at 150-300degreesC using multilayer extrusion molding, multilayer injecting molding or multilayer laminate molding. EXAMPLE - Polymerization tank was deaerated into which 1-hydro tridecafluoro hexane (in g) (671.1), AK225cb (RTM: 1,3-dichloro-1,1,2,2,3-pentafluoro propane) (167.8) and CH2=CH(CF2)4F obtained by press-fitting hexafluoro propylene (352), tetrafluoro ethylene (110.5) and ethylene (3.5) were added and heated at 66degreesC. To the resulting mixture 5 mass% of 1-hydro tridecafluoro hexane solution (6.7 ml) containing tert-butyl-peroxy pivalate as polymerization initiated was added and polymerized, to obtain monomer mixed gas of composition. Then, the slurry containing fluororesin was filtered using glass filter, to obtain fluororesin (78). The fluororesin had resin point of 175degreesC and capacitance flow rate (Q) value of 12 mm3/second. The fluororesin film of thickness 100 microns was formed by press-molding the obtained fluororesin. Similarly, another film of thickness 400 microns was formed using A2540 (RTM: ethylene-vinyl-acetate copolymer) as thermoplastic resin. The fluororesin film and ethylene-vinyl-acetate copolymer film were overlapped, hot-pressed at 170degreesC for 15 hours and adhered, to obtain laminated film. The laminated film had interlayer adhesive force of 4 N/cm.