A method for manufacturing a secondary battery, the method comprising: a first step comprising a process of providing a second electrode sheet, a first separation sheet, and a second separation sheet to be vertically stacked, a process of continuously cutting a first electrode sheet having polarity different from that of the second electrode sheet to manufacture a plurality of first electrode plates, and a process of providing the plurality of first electrode plates between the first and second separation sheets; a second step of bonding the second electrode sheet, the first separation sheet, and the second separation sheet, which are stacked between the first electrode plates, to each other; a third step of cutting the bonded portions of the second electrode sheet, the first separation sheet, and the second separation sheet to manufacture a radical unit in which a second electrode plate, a first separator, a first electrode plate, and a second separator are stacked, wherein the first and second separators form a separator pocket part accommodating the first electrode plate, the first and second separators being bonded to each other to define an accommodation groove in which the first electrode plate is accommodated; and a fourth step of stacking a plurality of radical units to manufacture an electrode assembly, wherein the second electrode plate and the separator pocket part have the same size, wherein the third step further comprises a process of temporarily bonding the first electrode plate to the accommodation groove of the separator pocket part, wherein a portion of the first electrode plate is temporarily bonded to the accommodation groove of the separator pocket part with bonding force less than that between the first separator and the second separator, and wherein the temporary bonding between the first electrode plate and the separator pocket part is performed at the same time together with the bonding between the first separator and the second separator. a first step comprising a process of providing a second electrode sheet, a first separation sheet, and a second separation sheet to be vertically stacked, a process of continuously cutting a first electrode sheet having polarity different from that of the second electrode sheet to manufacture a plurality of first electrode plates, and a process of providing the plurality of first electrode plates between the first and second separation sheets; a second step of bonding the second electrode sheet, the first separation sheet, and the second separation sheet, which are stacked between the first electrode plates, to each other; a third step of cutting the bonded portions of the second electrode sheet, the first separation sheet, and the second separation sheet to manufacture a radical unit in which a second electrode plate, a first separator, a first electrode plate, and a second separator are stacked, wherein the first and second separators form a separator pocket part accommodating the first electrode plate, the first and second separators being bonded to each other to define an accommodation groove in which the first electrode plate is accommodated; and a fourth step of stacking a plurality of radical units to manufacture an electrode assembly, wherein the second electrode plate and the separator pocket part have the same size, wherein the third step further comprises a process of temporarily bonding the first electrode plate to the accommodation groove of the separator pocket part, wherein a portion of the first electrode plate is temporarily bonded to the accommodation groove of the separator pocket part with bonding force less than that between the first separator and the second separator, and wherein the temporary bonding between the first electrode plate and the separator pocket part is performed at the same time together with the bonding between the first separator and the second separator.