NOVELTY - A film contains a resin composition comprising (in parts mass) ethylene resin composition (100), carbon-monoxide oxidation catalyst (1-150) and carbon-dioxide adsorption agent (1-200). The ethylene resin composition contains ethylene polymer (99-60 %mass) having peak top melting point along highest temperature side in differential-scanning-calorimetry melting curve of 110 degrees C or more, heat of fusion in differential-scanning-calorimetry melting curve of 90-180 J/g and crystallization fraction at 110 degrees C of 10-60%, and acid-modified ethylene-type resin (1-40 %mass).    USE - Film is used for electrical-double-layer capacitor, and nonaqueous electrolyte secondary battery (both claimed) e.g. lithium ion secondary battery for electric vehicle and hybrid vehicle.    ADVANTAGE - The film has excellent heat resistance, and oxidizes carbon monoxide to carbon dioxide and adsorbs carbon dioxide in absence of gaseous oxygen. The nonaqueous electrolyte secondary battery comprising the film is compact.    DETAILED DESCRIPTION - A film contains a resin composition comprising (in parts mass) ethylene resin composition (100), carbon-monoxide oxidation catalyst (1-150) and carbon-dioxide adsorption agent (1-200). The ethylene resin composition contains ethylene polymer (99-60 %mass) having peak top melting point along highest temperature side in differential-scanning-calorimetry melting curve of 110 degrees C or more, heat of fusion in differential-scanning-calorimetry melting curve of 90-180 J/g, crystallization fraction at 110 degrees C of 10-60% and melt flow rate of 0.1-10 g/10 minutes at 190 degrees C under load of 21.18 N, and acid-modified ethylene-type resin (1-40 %mass). The carbon-monoxide oxidation catalyst and carbon-dioxide adsorption agent have particle diameter (D99) of 30 mu m or less, and particle diameter (D50) of 20 mu m or less. INDEPENDENT CLAIMS are included for the following:    (1) nonaqueous electrolyte secondary battery, which has film in a container in which an electrical storage element is enclosed; and    (2) electrical-double-layer capacitor.