A refrigerator door includes an outer plate that is made of metal and defines a front surface of the refrigerator door, a door liner that is coupled to the outer plate and defines a rear surface of the refrigerator door, an insulator disposed in a space defined between the outer plate and the door liner and made of polyurethane, and a foam cushion disposed at a rear surface of the outer plate and configured to expand or contract based on a change of a volume of the insulator.