A secondary battery comprising: an outer can; a cap which covers an upper surface of the outer can; an electrode group which is a cathode and an anode wound with a separator being interposed therebetween, and which is stored in the outer can, the electrode group and the outer can forming spaces (X,Y) on end portions of the outer can in a winding axial direction; a first lead (16; 17) having a first welding surface (16a; 17a) and forming of band-shape, the first welding surface (16a;17a) dispose in one of the spaces (X,Y) and forming one of two planes in the band shape of the first lead (16;17); a second lead (17; 16) forming of band-shape and having a second welding surface (17a; 16a) which is bent with respect to the winding axial direction of the electrode group, the second welding surface (17a; 16a) dispose in the other of the spaces (X,Y) and forming one of two planes in the band shape of the second lead (17;16); a first current collecting tab (12;13) which is extended from one end of the electrode group on the winding axial direction, and welded onto only the first welding surface of the first lead in the one of the spaces (X,Y); a second current collecting tab (13; 12) which is extended from the other end of the electrode group on the winding axial direction, and welded onto only the second welding surface of the second lead in the other of the spaces (X,Y); a first terminal (14; 15) fixed to the cap and connected to the first lead; a second terminal (15;14) fixed to the cap and connected to the second lead; a first insulating member (21; 23) which is provided on an inner wall of the outer can in the one of the spaces (X,Y), the first insulating member preventing the first lead (16;17) and the first current collecting tab (12; 13) from being electrically connected to the inner wall of the outer can in the one of the spaces (X,Y); and a second insulating member (23; 21) which is provided on the inner wall of the outer can in the other of the spaces (X,Y), the second insulating member (23;21) preventing the second lead (17;16) and the second current collecting tab (13; 12) from being electrically connected to the inner wall of the outer can in the one of the spaces (X,Y), wherein the first welding surface (16a;17a) of the first lead (16;17) is a surface orthogonal to the winding axial direction of the electrode group and wherein the second welding surface (17a;16a) of the second lead (17;16) is a surface bent at an angle between 15 degrees and 75 degrees with respect to the winding axial direction of the electrode group. an outer can; a cap which covers an upper surface of the outer can; an electrode group which is a cathode and an anode wound with a separator being interposed therebetween, and which is stored in the outer can, the electrode group and the outer can forming spaces (X,Y) on end portions of the outer can in a winding axial direction; a first lead (16; 17) having a first welding surface (16a; 17a) and forming of band-shape, the first welding surface (16a;17a) dispose in one of the spaces (X,Y) and forming one of two planes in the band shape of the first lead (16;17); a second lead (17; 16) forming of band-shape and having a second welding surface (17a; 16a) which is bent with respect to the winding axial direction of the electrode group, the second welding surface (17a; 16a) dispose in the other of the spaces (X,Y) and forming one of two planes in the band shape of the second lead (17;16); a first current collecting tab (12;13) which is extended from one end of the electrode group on the winding axial direction, and welded onto only the first welding surface of the first lead in the one of the spaces (X,Y); a second current collecting tab (13; 12) which is extended from the other end of the electrode group on the winding axial direction, and welded onto only the second welding surface of the second lead in the other of the spaces (X,Y); a first terminal (14; 15) fixed to the cap and connected to the first lead; a second terminal (15;14) fixed to the cap and connected to the second lead; a first insulating member (21; 23) which is provided on an inner wall of the outer can in the one of the spaces (X,Y), the first insulating member preventing the first lead (16;17) and the first current collecting tab (12; 13) from being electrically connected to the inner wall of the outer can in the one of the spaces (X,Y); and a second insulating member (23; 21) which is provided on the inner wall of the outer can in the other of the spaces (X,Y), the second insulating member (23;21) preventing the second lead (17;16) and the second current collecting tab (13; 12) from being electrically connected to the inner wall of the outer can in the one of the spaces (X,Y), wherein the first welding surface (16a;17a) of the first lead (16;17) is a surface orthogonal to the winding axial direction of the electrode group and wherein the second welding surface (17a;16a) of the second lead (17;16) is a surface bent at an angle between 15 degrees and 75 degrees with respect to the winding axial direction of the electrode group.