A non-aqueous electrolyte secondary battery that can restrict lowering of battery performance during battery preservation is provided. A negative electrode that a negative electrode mixture including graphite is applied on a rolled copper foil and a positive electrode that a positive electrode mixture including lithium manganate is applied on an aluminum foil are used. An oxide in which one element selected from Al, Si, Ti, V, Cr, Fe, Ni, Cu, Zn, Zr, Mo, W, Pb and dissimilar to elements constituting the lithium manganate is oxidized is intermixed with the lithium manganate. An intermixture amount of the oxide is set such that a molar number of the dissimilar element contained in one gram of the positive electrode active material to a molar number of lithium contained in one gram of the positive electrode active material is not more than 5/1000. Charge transfer is restricted by the oxide during battery preservation.