A method of manufacturing an exterior décor panel for a refrigerator door, the method comprising: laminating a photosensitive dry film on a front surface of a metal sheet, the photosensitive dry film having a higher etch resistance than the metal sheet against an electrolytic solution; photo-masking the photosensitive dry film attached to the metal sheet to create a pattern having a minimum width of 0.1 mm in the photosensitive dry film, thereby exposing the front surface of the metal sheet corresponding to the pattern in the photosensitive dry film; electrolytic-polishing the photo-masked metal sheet by dipping the photo-masked metal sheet in an electrolytic bath to allow the electrolytic solution to contact the exposed front surface of the metal sheet and form the pattern in the front surface of the metal sheet; and performing post-treatment (S106, S108, S110) on the metal sheet, the post-treatment including washing and removing the photosensitive dry film, wherein the photo-masking comprises disposing a patterned output film on the photosensitive dry film, performing ultra-violet exposure of the photosensitive dry film to form the pattern in the photosensitive dry film, and developing the photosensitive dry film to remove an unexposed portion of the photosensitive dry film; wherein the metal sheet is composed of stainless steel, and wherein the electrolytic-polishing includes applying a voltage within a range of 0.4 V to 0.9 V to the metal sheet for a time between 2 to 6 minutes; and wherein the electrolytic-polishing includes providing a jig configured to secure the metal sheet dipped in the electrolytic bath, the jig comprising: an anode frame having a shape corresponding to the metal sheet, the anode frame being configured to support a rear surface of the metal sheet; a cathode frame spaced apart from the anode frame by a prescribed distance, the cathode frame being formed of a sheet having a shape corresponding to the metal sheet; and a plurality of connection frames connected between the anode frame and the cathode frame to maintain the distance between the anode frame and the cathode frame, the connection frames being configured to support a lower side and both lateral sides of the metal sheet seated between the anode frame and the cathode frame. laminating a photosensitive dry film on a front surface of a metal sheet, the photosensitive dry film having a higher etch resistance than the metal sheet against an electrolytic solution; photo-masking the photosensitive dry film attached to the metal sheet to create a pattern having a minimum width of 0.1 mm in the photosensitive dry film, thereby exposing the front surface of the metal sheet corresponding to the pattern in the photosensitive dry film; electrolytic-polishing the photo-masked metal sheet by dipping the photo-masked metal sheet in an electrolytic bath to allow the electrolytic solution to contact the exposed front surface of the metal sheet and form the pattern in the front surface of the metal sheet; and performing post-treatment (S106, S108, S110) on the metal sheet, the post-treatment including washing and removing the photosensitive dry film, wherein the photo-masking comprises disposing a patterned output film on the photosensitive dry film, performing ultra-violet exposure of the photosensitive dry film to form the pattern in the photosensitive dry film, and developing the photosensitive dry film to remove an unexposed portion of the photosensitive dry film; wherein the metal sheet is composed of stainless steel, and wherein the electrolytic-polishing includes applying a voltage within a range of 0.4 V to 0.9 V to the metal sheet for a time between 2 to 6 minutes; and wherein the electrolytic-polishing includes providing a jig configured to secure the metal sheet dipped in the electrolytic bath, the jig comprising: an anode frame having a shape corresponding to the metal sheet, the anode frame being configured to support a rear surface of the metal sheet; a cathode frame spaced apart from the anode frame by a prescribed distance, the cathode frame being formed of a sheet having a shape corresponding to the metal sheet; and a plurality of connection frames connected between the anode frame and the cathode frame to maintain the distance between the anode frame and the cathode frame, the connection frames being configured to support a lower side and both lateral sides of the metal sheet seated between the anode frame and the cathode frame. an anode frame having a shape corresponding to the metal sheet, the anode frame being configured to support a rear surface of the metal sheet; a cathode frame spaced apart from the anode frame by a prescribed distance, the cathode frame being formed of a sheet having a shape corresponding to the metal sheet; and a plurality of connection frames connected between the anode frame and the cathode frame to maintain the distance between the anode frame and the cathode frame, the connection frames being configured to support a lower side and both lateral sides of the metal sheet seated between the anode frame and the cathode frame.