A nonaqueous electrolyte battery, characterized by comprising: a flattened electrode group including positive electrodes and negative electrodes, each of the positive electrodes including a positive electrode current collector and a positive electrode current collector lead section protruding from the positive electrode current corrector, and each of the negative electrodes including a negative electrode current collector and a negative electrode current collector lead section protruding from the negative electrode current collector; a case having the electrode group housed therein and including a sealed portion in at least a part of a periphery; a positive electrode terminal having a bent section holding the positive electrode current collector lead sections and having one edge portion of the positive electrode terminal electrically connected to the positive electrode current collector lead sections, the other edge portion extending from the case through the sealed portion, and a curved portion arranged between the bent section and the other edge portion and curved within the space between the electrode group and the case such that the curved portion faces toward the electrode group; and a negative electrode terminal having a bent section holding the negative electrode current collector lead sections and having one edge portion of the negative electrode terminal electrically connected to the negative electrode current collector lead sections, the other edge portion extending from the case through the sealed portion, and a curved portion arranged between the bent section and the other edge portion and curved within the space between the electrode group and the case such that the curved portion faces toward the electrode group; wherein the positive electrode terminal satisfies formula given below and the negative electrode terminal satisfies formula given below: t 2 × W 2 ≥ 0.25 S p t 3 × W 3 ≥ 0.25 S n where S p denotes a cross-sectional area of the electrode group that is obtained when the electrode group is cut along a plane perpendicular to an extending direction of the positive electrode terminal, t 2 denotes a height of the positive electrode terminal in a direction perpendicular to an electrode reaction surface of the electrode group, W 2 denotes a width of the positive electrode terminal, S n denotes a cross-sectional area of the electrode group that is obtained when the electrode group is cut along a plane perpendicular to an extending direction of the negative electrode terminal, t 3 denotes a height of the negative electrode terminal in a direction perpendicular to the electrode reaction surface of the electrode group, and W 3 denotes a width of the negative electrode terminal. a flattened electrode group including positive electrodes and negative electrodes, each of the positive electrodes including a positive electrode current collector and a positive electrode current collector lead section protruding from the positive electrode current corrector, and each of the negative electrodes including a negative electrode current collector and a negative electrode current collector lead section protruding from the negative electrode current collector; a case having the electrode group housed therein and including a sealed portion in at least a part of a periphery; a positive electrode terminal having a bent section holding the positive electrode current collector lead sections and having one edge portion of the positive electrode terminal electrically connected to the positive electrode current collector lead sections, the other edge portion extending from the case through the sealed portion, and a curved portion arranged between the bent section and the other edge portion and curved within the space between the electrode group and the case such that the curved portion faces toward the electrode group; and a negative electrode terminal having a bent section holding the negative electrode current collector lead sections and having one edge portion of the negative electrode terminal electrically connected to the negative electrode current collector lead sections, the other edge portion extending from the case through the sealed portion, and a curved portion arranged between the bent section and the other edge portion and curved within the space between the electrode group and the case such that the curved portion faces toward the electrode group;