An electrode assembly (100; 1200) comprising: a first electrode unit (110; 1210) in which an electrode and a separator are alternately stacked; and a second electrode unit (130; 1230) in which an electrode and a separator are alternately stacked, the second electrode unit having a size less than that of the first electrode unit and being stacked on the first electrode unit, wherein a tab bonding body (150; 1250) manufactured by connecting an electrode tab provided in the first electrode unit (110; 1210) to an electrode tab provided in the second electrode unit (130; 1230) is disposed within a range of a width of the second electrode unit (130; 1230), a leading electrode tab (170; 1270) to which an electrode lead is connected is disposed on a portion of the first electrode unit, and the leading electrode tab (170; 1270) is disposed on a portion of the first electrode unit (110; 1210), at which the first electrode unit (110; 1210) and the second electrode unit (130; 1230) do not overlap each other, wherein the tab bonding body (150; 1250) comprises: a positive electrode tab bonding body (151; 1251) manufactured by connecting a positive electrode tab provided in the first electrode unit (110; 1210) to a positive electrode tab provided in the second electrode unit (130; 1230); and a negative electrode tab bonding body (153; 1253) manufactured by connecting a negative electrode tab provided in the first electrode unit (110; 1210) to a negative electrode tab provided in the second electrode unit (130; 1230), and wherein the leading electrode tab (170; 1270) comprises: a leading positive electrode tab (171; 1272) to which a positive electrode lead (181; 1281) is connected; and a leading negative electrode tab (173; 1273) to which a negative electrode lead (183; 1283) is connected. a first electrode unit (110; 1210) in which an electrode and a separator are alternately stacked; and a second electrode unit (130; 1230) in which an electrode and a separator are alternately stacked, the second electrode unit having a size less than that of the first electrode unit and being stacked on the first electrode unit, wherein a tab bonding body (150; 1250) manufactured by connecting an electrode tab provided in the first electrode unit (110; 1210) to an electrode tab provided in the second electrode unit (130; 1230) is disposed within a range of a width of the second electrode unit (130; 1230), a leading electrode tab (170; 1270) to which an electrode lead is connected is disposed on a portion of the first electrode unit, and the leading electrode tab (170; 1270) is disposed on a portion of the first electrode unit (110; 1210), at which the first electrode unit (110; 1210) and the second electrode unit (130; 1230) do not overlap each other, wherein the tab bonding body (150; 1250) comprises: a positive electrode tab bonding body (151; 1251) manufactured by connecting a positive electrode tab provided in the first electrode unit (110; 1210) to a positive electrode tab provided in the second electrode unit (130; 1230); and a negative electrode tab bonding body (153; 1253) manufactured by connecting a negative electrode tab provided in the first electrode unit (110; 1210) to a negative electrode tab provided in the second electrode unit (130; 1230), and wherein the leading electrode tab (170; 1270) comprises: a leading positive electrode tab (171; 1272) to which a positive electrode lead (181; 1281) is connected; and a leading negative electrode tab (173; 1273) to which a negative electrode lead (183; 1283) is connected. a positive electrode tab bonding body (151; 1251) manufactured by connecting a positive electrode tab provided in the first electrode unit (110; 1210) to a positive electrode tab provided in the second electrode unit (130; 1230); and a negative electrode tab bonding body (153; 1253) manufactured by connecting a negative electrode tab provided in the first electrode unit (110; 1210) to a negative electrode tab provided in the second electrode unit (130; 1230), and wherein the leading electrode tab (170; 1270) comprises: a leading positive electrode tab (171; 1272) to which a positive electrode lead (181; 1281) is connected; and a leading negative electrode tab (173; 1273) to which a negative electrode lead (183; 1283) is connected. a leading positive electrode tab (171; 1272) to which a positive electrode lead (181; 1281) is connected; and a leading negative electrode tab (173; 1273) to which a negative electrode lead (183; 1283) is connected.