Disclosed is a high-capacity nonaqueous electrolyte secondary battery which exhibits good charge/discharge cycle characteristics even under high temperature conditions in case when a nickel-containinglithium complex oxide is used as a positive electrode active material. Specifically disclosed is a nonaqueous electrolyte secondary battery comprising a positive electrode containing a nickel-containing lithium complex oxide as a positive electrode active material, a negative electrode capable of adsorbing and discharging lithium, a separator interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte solution containing a nonaqueous solvent and a solute dissolved in the nonaqueous solvent. This nonaqueous electrolyte secondary battery is characterized in that the molar ratio r of lithium relative to the other metal elements in the nickel-containing lithium complex oxide after discharge to a certain discharge final voltage is not less than 0.85 and not more than 0.92, and the nonaqueous electrolyte solution contains a fluorine-containing sulfonate compound.