An electrode body is disposed in a rectangular casing having an opening, and the opening of the rectangular casing is sealed by a sealing plate. A positive-electrode current collector is connected to a positive electrode terminal that extends through the sealing plate. A first positive-electrode tab group and the second positive-electrode tab group, which are connected to the electrode body, is connected to a surface of the positive-electrode current collector facing the electrode body. The first positive-electrode tab group and the second positive-electrode tab group are each disposed at an end portion of the electrode body adjacent to the sealing plate, and the first positive-electrode tab group and the second positive-electrode tab group are disposed so as to be bent in different directions.