A method of manufacturing a refrigerator door is provided. The method includes installing a display portion on a rear surface of a front decoration, the front decoration defining a front external appearance of the refrigerator door, coupling door decorations to both side ends of the front decoration, the door decorations defining both side external appearances of the refrigerator door, coupling cap decorations to upper and lower ends of the front decoration to which the door decorations are coupled, the cap decorations defining top and bottom external appearances of the refrigerator door, injecting foam liquid into a space defined by the front decoration, the door decorations and the cap decorations, and coupling a door liner to a rear of the front decoration.