TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The carbon cluster is fullerene derivative having functional group of proton dissociation property.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The content of vinylidene fluoride in vinylidene fluoride copolymer is 30-90 weight% and vinylidene fluoride polymer is 50-100 weight%. The weight ratio of vinylidene fluoride copolymer in core portion and vinylidene fluoride polymer in shell portion is 30/70-90/10. The proton-conductive resin composition contains (in weight%) carbon cluster (30-95) and vinylidene fluoride type resin (5-70). Preferred Process: The vinylidene fluoride copolymer and/or vinylidene fluoride polymer are cross-linked by fluorine-containing monomer. The polyelectrolyte-type fuel cell containing film-forming component contains proton conductive resin composition. EXAMPLE - Ammonium salt of perfluorooctane (in g) (4), sodium pyrophosphate (0.8), perfluoro divinyl ether (2) of formula: CF2=CFO(CF2)2OCF(CF3)CF2OCF=CF2, vinylidene fluoride (120), chlorotrifluoroethylene (80), ethyl acetate (1) and ion-exchange water (1000) were mixed, to obtain monomer mixture (203). The obtained monomer mixture (82) and 1 weight% aqueous solution ammonium-persulfate salt (20) were mixed and subjected to emulsion polymerization. The monomer mixture (121) were continuously added for 2 hours and subjected to polymerization, to obtain core portion of resin. Vinylidene fluoride (200), perfluoro divinyl ether (2) and ethyl acetate (1) were mixed, to obtain monomer mixture. The obtained monomer mixture and 1 weight% aqueous solution ammonium-persulfate salt (20) were mixed and subjected to emulsion polymerization. Then, the remaining monomer mixture is continuously supplied and subjected to polymerization for 6 hours, to obtain shell portion. Latex (1000) and calcium chloride aqueous solution (1000) were mixed with product and dried at 30 degrees C for 12 hours, to obtain core/shell type polyvinylidene fluoride. The dispersion liquid containing fullerene derivative having functional group of proton dissociation property (0.15) was mixed with N-methyl-2-pyrrolidone (0.85), to obtain fullerene derivative dispersion liquid. The obtained core/shell type resin (0.15) was dissolved in the dispersion liquid and heated at 60 degrees C. The obtained liquid was coated on glass plate and dried at 60 degrees C for 6 hours, to obtain proton conductor film having thickness of 25 mu m. The obtained proton conductor film had fracture elongation of 125%, ionic conductivity of 5.7x 10-3 and excellent elution property.