NONAQUEOUS ELECTROLYTE SOLUTION AND NONAQUEOUS SECONDARY BATTERY

The present invention provides a nonaqueous electrolyte solution which contains a nonaqueous solvent and a lithium salt, wherein: the nonaqueous solvent contains acetonitrile in an amount of 3% by volume to 97% by volume relative to the total amount of the nonaqueous solvent; the lithium salt contains a cyclic anion-containing lithium salt that is represented by formula (1) (wherein Rf moieties may be the same as or different from each other, and each represents a fluorine atom or a perfluoro group having 4 or less carbon atoms); and the content of the cyclic anion-containing lithium salt that is represented by formula (1) is from 0.001 to 5 in terms of the molar ratio relative to the content of the acetonitrile.