An embodiment of the present invention relates to a lithium secondary battery provided with: a nonaqueous electrolyte including a phosphate ester compound represented by general formula (1), namely O=P (O-R1)(O-R2)(O-R3) (in general formula (1): R1, R2, and R3 are alkyl groups or the like, or, groups including ether bonds represented by -R4-O-R5 (R4 represents an alkylene group, and R5 represents an alkyl group), at least one from among R1, R2, and R3 being a group including an ether bond, and at least one from among R1, R2, and R3 including fluorine); and a positive electrode active material having a charging/discharging area of at least 4.5V with respect to lithium.