NOVELTY - A nonaqueous electrolyte secondary battery has crosslinked component formed by covering main surfaces of one of negative electrode and positive electrode with solid polymer electrolyte composition containing polyether copolymer (a) having repeating units derived from oxirane and epoxy group-containing monomers (I) and (III), photoreaction initiator (b), and electrolytic salt compound (c). At least one of negative electrode material and positive electrode material contain polyether copolymer as one-component. The component (a) has weight average molecular weight of 50000-2500000.    USE - Nonaqueous electrolyte secondary battery e.g. lithium ion battery.    ADVANTAGE - The nonaqueous electrolyte secondary battery has high capacity and charging/discharging characteristics.    DETAILED DESCRIPTION - A nonaqueous electrolyte secondary battery has crosslinked component formed by covering main surfaces of one of negative electrode and positive electrode with solid polymer electrolyte composition containing polyether copolymer (a) having 5-95 mol% or repeating units derived from epoxy group-containing monomer of formula (I), 5-95 mol% of repeating units derived from oxirane and 0-10 mol% of repeating units derived from epoxy group-containing monomer of formula (III), photoreaction initiator (b), and electrolytic salt compound (c). At least one of the negative electrode material and positive electrode material contain polyether copolymer as one-component. The component (a) has weight average molecular weight of 50000-2500000.    R=1-12C alkyl or -CH2O(CR1R2R3);    R1-R3=H or -CH2O(CH2CH2O)nR4;    R4=1-12C alkyl;    n=0-12;and    R5=ethylenically unsaturated group.    An INDEPENDENT CLAIM is included for manufacture of nonaqueous electrolyte secondary battery, which involves polymerizing oxirane and epoxy group-containing monomers (I) and (III), obtaining negative electrode material and/or positive electrode material containing polyether copolymer as one component, coating solid polymer electrolyte composition on at least one main surface of negative electrode material and/or positive electrode material, and crosslinking the solid polymer electrolyte composition.