A nonaqueous electrolyte has electrolyte salt dissolved in a nonaqueous solvent,
wherein the ratio of the nonaqueous solvent having a ring structure is 50 wt %
or more in all nonaqueous electrolyte solution components and the nonaqueous solvent
includes at least one or more kinds of halogenated solvents expressed by a below-described
general formula (1).
##STR1##
(Here, at least one of R1 and R2 designates an alkyl
group having the number of carbons of 4 or larger and at least one of them is a
halogenated alkyl group).
Thus, the decomposition of the halogenated solvent is suppressed.
