RESIN COMPOSITION FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING SAME, RESIN COMPOSITION FOR ELECTRODE MIXTURE LAYER, ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

An object of the present invention is to provide a resin composition for a non-aqueous electrolyte secondary battery, the resin composition including a vinylidene fluoride copolymer which has: a high adhesive strength with respect to a constituent material of the non-aqueous electrolyte secondary battery, small swelling caused by an electrolytic solution, and high solubility with respect to N-methylpyrrolidone. A resin composition for a non-aqueous electrolyte secondary battery that achieves the above object includes a vinylidene fluoride copolymer having a constituent unit derived from vinylidene fluoride and a constituent unit derived from a fluorine-containing alkyl vinyl compound. A melting point, measured in accordance with ASTM D3418, of the vinylidene fluoride copolymer is from 105°C to 125°C, and a mass fraction W of the constituent unit derived from the fluorine-containing alkyl vinyl compound in the vinylidene fluoride copolymer, a degree of crystallinity Dc of the vinylidene fluoride copolymer, and a degree of amorphicity D of the vinylidene fluoride copolymer satisfy Equation (1) below: 4.7 ≤ W a × D C / D A ≤ 14