NOVELTY - A non-aqueous electrolyte solution comprises ester compound (I), cyclic carbonate compound having carbon-carbon triple bond and fluorine atom, and a compound chosen from nitrile compound, isocyanate compound, aromatic-hydrocarbon, fluorinated aromatic compound, and monofluoro phosphate, difluoro phosphate, and acid anhydrides, where the electrolyte solution is utilized for a secondary battery that is provided with positive electrode having a positive electrode active material that occludes/releases a metal ion, and a negative electrode having a negative electrode active material.    USE - Non-aqueous electrolyte solution for a lithium ion secondary battery (claimed) that is utilized in an electronic device. Uses include but are not limited to notebook personal computer, pen input personal computer, mobile personal computer, electronic book player, mobile telephone, portable FAX, portable copy, portable printer, headphones stereo, video movie, liquid crystal television, handicap cleaner, portable CD, minidisk, transceiver, electronic organizer, calculator, memory card, portable tape recorder, radio, backup power supply, motor, motor vehicle, motorbike, bicycle with motor engine, bicycle, lighting fixture, toy, game machine device, timepiece, electric tool, electronic flash, camera and domestic-use large sized storage battery.    ADVANTAGE - The solution can suppress disassembly, gas-evolution and deterioration of the secondary battery when the battery is utilized in high-temperature environment, and manufacture the battery with high energy density, improved cycling characteristics and internal resistance.    DETAILED DESCRIPTION - A non-aqueous electrolyte solution comprises ester compound of formula (I), cyclic carbonate compound having carbon-carbon triple bond and fluorine atom, and a compound chosen from nitrile compound, isocyanate compound, aromatic-hydrocarbon, fluorinated aromatic compound, and monofluoro phosphate, difluoro phosphate, and acid anhydrides, where the content of non-aqueous electrolyte solution 0.01-10 mass%, and electrolyte solution is utilized for a secondary battery that is provided with positive electrode having a positive electrode active material that occludes/releases a metal ion, and a negative electrode having a negative electrode active material that occludes/releases a metal ion.    R1, R2 = alkyl, fluorinated alkyl, alkenyl, alkynyl or aryl.    An INDEPENDENT CLAIM is also included for a non-aqueous electrolyte solution secondary battery comprising a positive electrode having a positive electrode active material that occludes/releases a metal ion, and a negative electrode having a negative electrode active material that occludes/releases a metal ion.