A nonaqueous electrolyte secondary battery having a positive electrode including a positive electrode active material, a negative electrode and a nonaqueous electrolyte comprising a solute dissolved in a solvent, the positive electrode active material is a mixture of a lithium-manganese composite oxide and a lithium-nickel composite oxide represented by LiNiaM11- aO2 (M1 being at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Co, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and a being 0<a<=1) and/or a lithium-cobalt composite oxide represented by LiCobM21- bO2 (M2 being at least one element selected from the group consisting of B, Mg, Al, Ti, Mn, V, Fe, Ni, Cu, Zn, Ga, Y, Zr, Nb, Mo and In, and being 0<b<=1), and the nonaqueous electrolyte contains a phosphoric ester and an ether or an ester having a halogen substituted phenyl.