The present invention provides a rectangular secondary battery with high volume energy density and high reliability. An electrode body (3), which includes a positive electrode plate and a negative electrode plate, is contained in a battery case (100), which is composed of a rectangular casing (1) and a sealing plate (2). A first positive-electrode tab group (40a), which is composed of a pluralityof positive electrode tabs, and a second positive-electrode tab group (40b), which is composed of a plurality of positive electrode tabs, are disposed between the sealing plate (2) and the electrode body. The first positive-electrode tab group (40a) and the second positive-electrode tab group (40b) are disposed so as to be displaced from each other in the longitudinal direction of the sealing plate. The first positive-electrode tab group (40a) and the second positive-electrode tab group (40b) are connected to different positions on a positive-electrode current collector.