A pouch type secondary battery comprising: an electrode assembly including a cathode plate, an anode plate, and a separator; a pouch surrounding the electrode assembly; and electrode tabs connected to both ends of the electrode assembly and protruding outward of the pouch, wherein the electrode tabs connected to the both ends of the electrode assembly include two or more cathode tabs and anode tabs, respectively, and Wc/Hc > 4 in which Hc is a length of a battery cell at edges in a first direction of the battery cell to which the electrode tabs are connected and Wc is a length of the battery cell at edges in a second direction of the battery cell except for protrusion lengths of the electrode tabs, the second direction being perpendicular to the first direction, wherein both ends of edges of the cathode tab and the anode tab in the second direction have a shape in which thicknesses thereof are gradually decreased in the first direction, wherein sealing films for protecting the electrode tabs at the time of sealing the pouch are disposed at connected portions to which the electrode tabs are connected, in a form in which the sealing films surround the electrode tabs, and the sealing films are disposed in a form in which the sealing films surround the cathode tab and the anode tab, respectively, wherein 0.3mm < t1 < 1.5mm and 1.0 < t1/t2 < 2.0 in which t1 is a thickness of the cathode tab and t2 is a thickness of the anode tab, wherein 0.3 < (Wt1+Wt2)/Hc < 0.6 in which Wt1 is a width of the cathode tab and Wt2 is a width of the anode tab, and wherein 0.7 < (Ws1+Ws2)/Hc < 0.9 in which Ws1 is a width of a cathode tab sealing film surrounding the cathode tab and Ws2 is a width of an anode tab sealing film surrounding the anode tab. an electrode assembly including a cathode plate, an anode plate, and a separator; a pouch surrounding the electrode assembly; and electrode tabs connected to both ends of the electrode assembly and protruding outward of the pouch, wherein the electrode tabs connected to the both ends of the electrode assembly include two or more cathode tabs and anode tabs, respectively, and Wc/Hc > 4 in which Hc is a length of a battery cell at edges in a first direction of the battery cell to which the electrode tabs are connected and Wc is a length of the battery cell at edges in a second direction of the battery cell except for protrusion lengths of the electrode tabs, the second direction being perpendicular to the first direction, wherein both ends of edges of the cathode tab and the anode tab in the second direction have a shape in which thicknesses thereof are gradually decreased in the first direction, wherein sealing films for protecting the electrode tabs at the time of sealing the pouch are disposed at connected portions to which the electrode tabs are connected, in a form in which the sealing films surround the electrode tabs, and the sealing films are disposed in a form in which the sealing films surround the cathode tab and the anode tab, respectively, wherein 0.3mm < t1 < 1.5mm and 1.0 < t1/t2 < 2.0 in which t1 is a thickness of the cathode tab and t2 is a thickness of the anode tab, wherein 0.3 < (Wt1+Wt2)/Hc < 0.6 in which Wt1 is a width of the cathode tab and Wt2 is a width of the anode tab, and wherein 0.7 < (Ws1+Ws2)/Hc < 0.9 in which Ws1 is a width of a cathode tab sealing film surrounding the cathode tab and Ws2 is a width of an anode tab sealing film surrounding the anode tab.