A connection member for secondary batteries to achieve the electrical connection in a battery pack including two or more cylindrical secondary batteries in a physical contact manner, the connection member comprising a terminal connection unit for connecting the battery cells arranged in the longitudinal direction in series to each other, wherein the terminal connection unit comprises: (a) an outer circumferential contact part contacting an electrode terminal of a lower battery cell located below the connection member along the outer circumferential region of the electrode terminal of the lower battery cell, such that the outer circumferential contact part can be electrically connected to the electrode terminal of the lower battery cell in a surface contact manner, for minimizing the change of resistance at the contact region against an external force and restraining a possibility that the electrode terminal of the lower battery cell is depressed, in which the outer circumferential contact part is configured to correspond to the external shape of the electrode terminal of the lower battery cell and contact the electrode terminal of the lower battery cell at a region adjacent to the outer circumference of the electrode terminal and have a predetermined width; (b) a central contact part contacting an electrode terminal of an upper battery cell located above the connection member for providing an elastic contact force to the entire connection member mounted between the electrode terminals of the respective battery cells, the central contact part comprising upward protruding parts tapered upward from the outer circumferential contact part toward a central axis of the terminal connection unit for elastically supporting the lower battery cell, wherein the central contact part is constructed in an upward protruding bridge structure having an opening; and (c) one or more auxiliary connection parts (140;142) connected to the electrode terminal of the upper battery cell, or the electrode terminal of the lower battery cell, or the electrode terminals of the upper and lower battery cells while being elastically pressed. (a) an outer circumferential contact part contacting an electrode terminal of a lower battery cell located below the connection member along the outer circumferential region of the electrode terminal of the lower battery cell, such that the outer circumferential contact part can be electrically connected to the electrode terminal of the lower battery cell in a surface contact manner, for minimizing the change of resistance at the contact region against an external force and restraining a possibility that the electrode terminal of the lower battery cell is depressed, in which the outer circumferential contact part is configured to correspond to the external shape of the electrode terminal of the lower battery cell and contact the electrode terminal of the lower battery cell at a region adjacent to the outer circumference of the electrode terminal and have a predetermined width; (b) a central contact part contacting an electrode terminal of an upper battery cell located above the connection member for providing an elastic contact force to the entire connection member mounted between the electrode terminals of the respective battery cells, the central contact part comprising upward protruding parts tapered upward from the outer circumferential contact part toward a central axis of the terminal connection unit for elastically supporting the lower battery cell, wherein the central contact part is constructed in an upward protruding bridge structure having an opening; and (c) one or more auxiliary connection parts (140;142) connected to the electrode terminal of the upper battery cell, or the electrode terminal of the lower battery cell, or the electrode terminals of the upper and lower battery cells while being elastically pressed.