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 (111, 112) connected to the electrode and protruding from one side of the electrode; a first electrode lead (12a, 12c) having one end connected to the electrode tab (111, 112); a second electrode lead (12b, 12d) having one end connected to the other end of the first electrode lead (12a, 12c) and the other end protruding to the outside of the battery case; and a connection part bonding the first electrode lead (12a, 12c) to the second electrode lead (12b, 12d) to connect the first and second electrode leads to each other, wherein a first inclined surface (17, 17a) 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 (16, 16e) disposed on a side of the other end of the first electrode lead (12a, 12c), wherein the step compensation part (16, 16e) contacts the other end of the first electrode lead, wherein the step compensation part (16, 16e) has non-conductivity, wherein the first inclined surface (17, 17a) has an obtuse angle with respect to a bonding surface on which the first electrode lead (12a, 12c) and the second electrode lead (12b, 12d) 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 (111, 112) connected to the electrode and protruding from one side of the electrode; a first electrode lead (12a, 12c) having one end connected to the electrode tab (111, 112); a second electrode lead (12b, 12d) having one end connected to the other end of the first electrode lead (12a, 12c) and the other end protruding to the outside of the battery case; and a connection part bonding the first electrode lead (12a, 12c) to the second electrode lead (12b, 12d) to connect the first and second electrode leads to each other, wherein a first inclined surface (17, 17a) 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 (16, 16e) disposed on a side of the other end of the first electrode lead (12a, 12c), wherein the step compensation part (16, 16e) contacts the other end of the first electrode lead, wherein the step compensation part (16, 16e) has non-conductivity, wherein the first inclined surface (17, 17a) has an obtuse angle with respect to a bonding surface on which the first electrode lead (12a, 12c) and the second electrode lead (12b, 12d) 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.