A secondary battery comprising: an electrode assembly comprising a main tab (114, 114A, 114B); a current collecting member adjacent the main tab (114, 114A, 114B); and a sub-tab (160, 260) electrically connecting the main tab (114, 114A, 114B) to the current collecting member, wherein the electrode assembly comprises a plurality of first and second electrode plates (111, 112) and separators stacked on each other and has a pair of long-side regions and a short-side region extending between the long-side regions, wherein the main tab (114, 114A, 114B) extends from a portion of the short-side region of the electrode assembly, and wherein the current collecting member includes a vertical portion (151, 152, 153) contacting the short-side region of the electrode assembly and having a slit through which the main tab (114, 114A, 114B) passes, characterized in that the vertical portion of the current collecting member comprises: a first region at one side of the slit and contacting the short-side region of the electrode assembly; a second region at another side of the slit and contacting the short-side region of the electrode assembly; and a third region connecting the first region with the second region and contacting the short-side region of the electrode assembly, and the sub-tab (160, 260) comprises: a first section welded to the first region of the current collecting member; a second section welded to the second region of the current collecting member; a third section extending from the first section and welded to one surface of the main tab (114, 114A, 114B); and a fourth section extending from the second section and welded to another surface of the main tab (114, 114A, 114B), wherein the main tab (114, 114A, 114B) is inserted between the third section and the fourth section of the sub-tab and is welded to the third section and the fourth section of the sub-tab, the sub-tab (160, 260) and the main tab (114, 114A, 114B) being bent in the same direction on the current collecting member in a direction parallel to the vertical portion of the current collecting member. an electrode assembly comprising a main tab (114, 114A, 114B); a current collecting member adjacent the main tab (114, 114A, 114B); and a sub-tab (160, 260) electrically connecting the main tab (114, 114A, 114B) to the current collecting member, wherein the electrode assembly comprises a plurality of first and second electrode plates (111, 112) and separators stacked on each other and has a pair of long-side regions and a short-side region extending between the long-side regions, wherein the main tab (114, 114A, 114B) extends from a portion of the short-side region of the electrode assembly, and wherein the current collecting member includes a vertical portion (151, 152, 153) contacting the short-side region of the electrode assembly and having a slit through which the main tab (114, 114A, 114B) passes, characterized in that a first region at one side of the slit and contacting the short-side region of the electrode assembly; a second region at another side of the slit and contacting the short-side region of the electrode assembly; and a third region connecting the first region with the second region and contacting the short-side region of the electrode assembly, and a first section welded to the first region of the current collecting member; a second section welded to the second region of the current collecting member; a third section extending from the first section and welded to one surface of the main tab (114, 114A, 114B); and a fourth section extending from the second section and welded to another surface of the main tab (114, 114A, 114B), wherein the main tab (114, 114A, 114B) is inserted between the third section and the fourth section of the sub-tab and is welded to the third section and the fourth section of the sub-tab, the sub-tab (160, 260) and the main tab (114, 114A, 114B) being bent in the same direction on the current collecting member in a direction parallel to the vertical portion of the current collecting member.