NONAQUEOUS ELECTROLYTE SOLUTION FOR SECONDARY BATTERY, AND SECONDARY BATTERY

To provide a non-aqueous electrolyte solution for secondary batteries, which has long-term nonflammability and practically sufficient conductivity and which is capable of suppressing a decrease of battery capacity due to charge and discharge at a high rate, and a secondary battery using such a non-aqueous electrolyte solution. A non-aqueous electrolyte solution for secondary batteries, comprising a lithium salt and a solvent for dissolving the electrolyte salt, containing a specific hydrofluoroether, a specific ether other than such a hydrofluoroether, and a predetermined amount of a cyclic carbonate compound which is a compound having a ring made of carbon atoms and oxygen atoms, said ring containing a bond represented by -O-C(=O)-O-, and which contains no carbon-carbon unsaturated bond in its molecule; and a secondary battery comprising such non-aqueous electrolyte solution for secondary batteries, a positive electrode and a negative electrode.