Abstract: An object is to provide a film that provides a capacitor excellent in safety function operability, and that has a high level of dielectric breakdown strength at high temperatures and good element-winding suitability. The object is achieved by a film containing a syndiotactic polystyrene resin and a polyphenylene ether resin, the content of the syndiotactic polystyrene resin in the film being 50 mass % or higher, the content of the polyphenylene ether resin in the film being 10 mass % or higher, wherein (A) the film contains titanium oxide particles as inorganic particles, and the content of the titanium oxide particles in the film is 0.55 mass % or higher and 3 mass % or lower, and/or (B) at least one surface of the film has a reduced peak height Spk of 0.05 ?m or more and 0.30 ?m or less.

Abstract: Provided is a technique of obtaining films with higher dielectric breakdown strength at high temperatures and folding resistance. A resin composition comprises (1) a syndiotactic polystyrene resin, (2) a polyphenylene ether resin, and (3) at least one member selected from the group consisting of styrene-based thermoplastic elastomers and atactic polystyrene resins, wherein the content of the polyphenylene ether resin in the resin composition is 6 mass % or more.