A pouch type secondary battery comprising: an electrode assembly in which an electrode comprising a positive electrode and a negative electrode and a separator are laminated; a battery case having a pouch shape to accommodate the electrode assembly ; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab ; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to the outside of the battery case ; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein a first inclined surface is provided on at least one of the other end of the first electrode lead and the one end of the second electrode lead , the battery further comprising a step compensation part disposed on a side of the other end of the first electrode lead , wherein the step compensation part contacts the other end of the first electrode lead , wherein the step compensation part has non-conductivity, wherein the first inclined surface has an obtuse angle with respect to a bonding surface on which the first electrode lead and the second electrode lead are bonded to each other through the connection part , the battery further comprising an insulation part surrounding a portion of each of the first and second electrode leads to allow the first and second electrode leads to be bonded to the battery case, wherein a bonding force between each of the first and second electrode leads (12a, 12c; 12b, 12d) and the connection part is less than that between each of the first and second electrode leads (12a, 12c; 12b, 12d) and the insulation part . an electrode assembly in which an electrode comprising a positive electrode and a negative electrode and a separator are laminated; a battery case having a pouch shape to accommodate the electrode assembly ; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab ; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to the outside of the battery case ; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein a first inclined surface is provided on at least one of the other end of the first electrode lead and the one end of the second electrode lead , the battery further comprising a step compensation part disposed on a side of the other end of the first electrode lead , wherein the step compensation part contacts the other end of the first electrode lead , wherein the step compensation part has non-conductivity, wherein the first inclined surface has an obtuse angle with respect to a bonding surface on which the first electrode lead and the second electrode lead are bonded to each other through the connection part , the battery further comprising an insulation part surrounding a portion of each of the first and second electrode leads to allow the first and second electrode leads to be bonded to the battery case, wherein a bonding force between each of the first and second electrode leads (12a, 12c; 12b, 12d) and the connection part is less than that between each of the first and second electrode leads (12a, 12c; 12b, 12d) and the insulation part . <EOS>