A nonaqueous electrolyte secondary battery comprising: a wound electrode assembly in which a positive electrode having, at one end in a width direction of the positive electrode, a positive electrode exposed portion provided without a positive electrode mixture layer on a positive electrode current collector and a negative electrode having, at one end in a width direction of the negative electrode, a negative electrode exposed portion provided without a negative electrode mixture layer on a negative electrode current collector are wound together, with a separator interposed therebetween, wherein the positive electrode exposed portion protrudes outward in an axial direction of the wound electrode assembly relative to the separator and the negative electrode at one end in the axial direction of the wound electrode assembly, the negative electrode exposed portion protrudes outward in the axial direction of the wound electrode assembly relative to the separator and the positive electrode at the other end in the axial direction of the wound electrode assembly, and a part of the negative electrode mixture layer forming an outermost circumferential portion of the negative electrode is provided on an outer circumferential side of the wound electrode assembly with respect to an outer-circumferential-side positive electrode mixture layer, characterized in that the positive electrode exposed portion has a cutout portion only in an outermost circumferential portion of the positive electrode of the wound electrode assembly, wherein, of longitudinal end portions of the positive electrode, the end portion with the cutout portion is a winding finish end. a wound electrode assembly in which a positive electrode having, at one end in a width direction of the positive electrode, a positive electrode exposed portion provided without a positive electrode mixture layer on a positive electrode current collector and a negative electrode having, at one end in a width direction of the negative electrode, a negative electrode exposed portion provided without a negative electrode mixture layer on a negative electrode current collector are wound together, with a separator interposed therebetween, wherein the positive electrode exposed portion protrudes outward in an axial direction of the wound electrode assembly relative to the separator and the negative electrode at one end in the axial direction of the wound electrode assembly, the negative electrode exposed portion protrudes outward in the axial direction of the wound electrode assembly relative to the separator and the positive electrode at the other end in the axial direction of the wound electrode assembly, and a part of the negative electrode mixture layer forming an outermost circumferential portion of the negative electrode is provided on an outer circumferential side of the wound electrode assembly with respect to an outer-circumferential-side positive electrode mixture layer, characterized in that the positive electrode exposed portion has a cutout portion only in an outermost circumferential portion of the positive electrode of the wound electrode assembly, wherein, of longitudinal end portions of the positive electrode, the end portion with the cutout portion is a winding finish end.