A stacked battery comprising: (a) a square battery element in which a tabular positive electrode, a separator and a tabular negative electrode are laminated, wherein one side of the battery element is a terminal connection section pulled-out surface, which is provided on both the positive and negative electrodes and wherein a plate-like positive-electrode terminal connection section and a plate-like negative-electrode terminal connection section are both pulled out; (b) projection surfaces, which are generated by vertically projecting the positive-electrode terminal connection section and the negative electrode terminal connection section onto surfaces extending from positive and negative electrodes, do not cross each other; (c) a surface of the positive electrode and a surface of the negative electrode, which are facing each other, are different in area; (d) each electrode is disposed so that an entire projection portion, which is generated by projecting the small-area electrode onto a surface of a large-area electrode that faces the small-area electrode, is positioned on the large-area electrode; and (e) a first bumping section (33a to 33d) is provided on a separator to limit movements of negative electrodes as a negative-electrode end surface hit the bumping section (33a to 33d); (f) a second bumping section (37a to 37c) is provided on the separator to limit movements of positive electrodes as a positive-electrode end surface hit the bumping section (37a to 37c); (g) a third bumping section (33e to 33g) is provided on the separator to limit movements of the positive electrodes in a direction opposite to the direction in which the positive terminal connection section is pulled-out; (h) the first bumping section (33a to 33d) is made up of a first crease (31a to 31d) of the separator, the second bumping section (37a to 37c) is made up of a joining section (35a to 35c) of the separator, and the third bumping section (33e to 33g) is made up of a second crease (31e to 31g) of the separator; (i) wherein the separator is made up of a zigzag-pattern member whose creases (31a to 31d; 31e to 31g) of zigzag-pattern are positioned on the terminal connection section pulled-out surface and a surface that is on the opposite side from the terminal connection section pulled-out surface; (j) an opening (32a, 32b, and 32c) is formed on the first crease (31a to 31d) of the separator; (k) the negative-electrode terminal connection section is pulled out from the separator through the opening; (l) the positive electrode terminal connection section and the negative electrode terminal connection section are pulled out in the same direction; and (m) all separators laminated on the electrode surfaces are bonded together with the creases (31a to 31d; 31e to 31g) or joining sections. (a) a square battery element in which a tabular positive electrode, a separator and a tabular negative electrode are laminated, wherein one side of the battery element is a terminal connection section pulled-out surface, which is provided on both the positive and negative electrodes and wherein a plate-like positive-electrode terminal connection section and a plate-like negative-electrode terminal connection section are both pulled out; (b) projection surfaces, which are generated by vertically projecting the positive-electrode terminal connection section and the negative electrode terminal connection section onto surfaces extending from positive and negative electrodes, do not cross each other; (c) a surface of the positive electrode and a surface of the negative electrode, which are facing each other, are different in area; (d) each electrode is disposed so that an entire projection portion, which is generated by projecting the small-area electrode onto a surface of a large-area electrode that faces the small-area electrode, is positioned on the large-area electrode; and (e) a first bumping section (33a to 33d) is provided on a separator to limit movements of negative electrodes as a negative-electrode end surface hit the bumping section (33a to 33d); (f) a second bumping section (37a to 37c) is provided on the separator to limit movements of positive electrodes as a positive-electrode end surface hit the bumping section (37a to 37c); (g) a third bumping section (33e to 33g) is provided on the separator to limit movements of the positive electrodes in a direction opposite to the direction in which the positive terminal connection section is pulled-out; (h) the first bumping section (33a to 33d) is made up of a first crease (31a to 31d) of the separator, the second bumping section (37a to 37c) is made up of a joining section (35a to 35c) of the separator, and the third bumping section (33e to 33g) is made up of a second crease (31e to 31g) of the separator; (i) wherein the separator is made up of a zigzag-pattern member whose creases (31a to 31d; 31e to 31g) of zigzag-pattern are positioned on the terminal connection section pulled-out surface and a surface that is on the opposite side from the terminal connection section pulled-out surface; (j) an opening (32a, 32b, and 32c) is formed on the first crease (31a to 31d) of the separator; (k) the negative-electrode terminal connection section is pulled out from the separator through the opening; (l) the positive electrode terminal connection section and the negative electrode terminal connection section are pulled out in the same direction; and (m) all separators laminated on the electrode surfaces are bonded together with the creases (31a to 31d; 31e to 31g) or joining sections.