A battery comprising: an electrode body including a strip-shaped positive electrode sheet and a strip-shaped negative electrode sheet having higher heat conductivity than the positive electrode sheet, the positive electrode sheet and the negative electrode sheet being overlapped and wound about an axis in a flat shape by interposing strip-shaped separators made of porous resin between the positive and negative electrode sheets (31, 41), the electrode body having a positive-electrode protruding wound part that is formed of an edge portion of the positive electrode sheet on one side in a width direction and protrudes in a flat spiral form toward a first side in an axial direction; and a positive terminal member having a terminal connecting portion connected to the positive-electrode protruding wound part of the electrode body, wherein the electrode body being flat, includes: a first-side curved end part located on a first side in an electrode body width direction intersecting the axial direction and an electrode body thickness direction, and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another; and a second-side curved end part located on a second side in the electrode body width direction and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another, wherein the positive electrode sheet includes a positive-electrode innermost curved portion bent at smallest radius curvature and placed in the first-side curved end part, when a dimension in the electrode body width direction from a positive-electrode connecting portion of the positive-electrode protruding wound part connected to the terminal connecting portion to an end of the first-side curved end part of the electrode body on the first side in the electrode body width direction is defined as a distance Ha, and a dimension in the electrode body width direction from the positive-electrode connecting portion to an end of the second-side curved end part of the electrode body in the electrode body width direction is defined as a distance Hb, the terminal connecting portion is connected to the positive-electrode connecting portion at a position where the distance Ha and the distance Hb satisfy a relation of 1.1Hb ≤ Ha ≤ 2.5Hb. an electrode body including a strip-shaped positive electrode sheet and a strip-shaped negative electrode sheet having higher heat conductivity than the positive electrode sheet, the positive electrode sheet and the negative electrode sheet being overlapped and wound about an axis in a flat shape by interposing strip-shaped separators made of porous resin between the positive and negative electrode sheets (31, 41), the electrode body having a positive-electrode protruding wound part that is formed of an edge portion of the positive electrode sheet on one side in a width direction and protrudes in a flat spiral form toward a first side in an axial direction; and a positive terminal member having a terminal connecting portion connected to the positive-electrode protruding wound part of the electrode body, wherein the electrode body being flat, includes: a first-side curved end part located on a first side in an electrode body width direction intersecting the axial direction and an electrode body thickness direction, and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another; and a second-side curved end part located on a second side in the electrode body width direction and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another, a first-side curved end part located on a first side in an electrode body width direction intersecting the axial direction and an electrode body thickness direction, and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another; and a second-side curved end part located on a second side in the electrode body width direction and formed of the positive electrode sheet, the negative electrode sheet, and the separators which are bent in a semi-cylindrical shape and overlapped one on another, wherein the positive electrode sheet includes a positive-electrode innermost curved portion bent at smallest radius curvature and placed in the first-side curved end part, when a dimension in the electrode body width direction from a positive-electrode connecting portion of the positive-electrode protruding wound part connected to the terminal connecting portion to an end of the first-side curved end part of the electrode body on the first side in the electrode body width direction is defined as a distance Ha, and a dimension in the electrode body width direction from the positive-electrode connecting portion to an end of the second-side curved end part of the electrode body in the electrode body width direction is defined as a distance Hb, the terminal connecting portion is connected to the positive-electrode connecting portion at a position where the distance Ha and the distance Hb satisfy a relation of 1.1Hb ≤ Ha ≤ 2.5Hb.