The present invention provides a lithium secondary battery having excellent battery cycle property, electrical capacity, storage characteristic and other battery characteristics for a long period of time, and a nonaqueous electrolytic solution which is usable for the lithium secondary battery.A nonaqueous electrolytic solution in which an electrolyte salt is dissolved in a nonaqueous solvent, comprising (i) a dicarbonyl compound represented by the general formula (I), or (ii) a dicarbonyl compound represented by the general formula (II) and vinylene carbonate and the like in the nonaqueous electrolytic solution. ##STR00001## (wherein R.sup.1 represents a hydrogen atom, an alkyl group, an alkenyl group, a phenyl group or the like; and X represents a hydrogen atom, an R.sup.2 group or an OR.sup.2 group. R.sup.2 represents an alkyl group, an alkenyl group, a phenyl group or the like.) ##STR00002## (wherein R.sup.1 and X are the same as above; Y and Z represents a hydrogen atom, an R.sup.2 group, an OR.sup.2 group, a COR.sup.2 group or a CH.sub.2COR.sup.2 group; and n is 1 to 6.).