An evaporator (100, 200, 300, 400, 500) comprising: an evaporator case (110, 210, 310, 410, 510) having an empty box shape in which both sides are open and forming a storage space for food therein; a cooling tube (120, 220, 320, 420, 520) formed in a predetermined pattern on the evaporator case (110, 210, 310, 410, 510) and filled with a refrigerant for cooling; and a foil heater (130, 230, 330, 430, 530) attached to be in surface-contact with the evaporator case (110, 210, 310, 410, 510) and generating heat when power is applied thereto such that heat for defrosting is transferred to the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) is formed in the form of a soft sheet, and attached to be in surface-contact with the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) is attached to an outer surface of the evaporator case (110, 210, 310, 410, 510), characterized in that wherein the foil heater (130, 230, 330, 430, 530) extends along the edges of the evaporator case (110, 210, 310, 410, 510), and wherein the foil heater (130, 230, 330, 430, 530) is disposed not to overlap the cooling tube (120, 220, 320, 420, 520),wherein the evaporator case (110, 210, 310, 410, 510) is formed by bending two coupled case sheets (111, 112) to have a quadrangular box shape in which a lower surface portion, side surface portions (110b', 110b"), and an upper surface portion (110c', 110c") are provided and both sides thereof are open, and the foil heater (130, 230, 330, 430, 530) is attached to be in surface-contact with at least a portion of each of the lower surface portion, the side surface portions (110b', 110b"), and the upper surface portion (110c', 110c") to surround the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) extends along the edges of the two coupled case sheets (111, 112) to surround the cooling tube (120, 220, 320, 420, 520). an evaporator case (110, 210, 310, 410, 510) having an empty box shape in which both sides are open and forming a storage space for food therein; a cooling tube (120, 220, 320, 420, 520) formed in a predetermined pattern on the evaporator case (110, 210, 310, 410, 510) and filled with a refrigerant for cooling; and a foil heater (130, 230, 330, 430, 530) attached to be in surface-contact with the evaporator case (110, 210, 310, 410, 510) and generating heat when power is applied thereto such that heat for defrosting is transferred to the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) is formed in the form of a soft sheet, and attached to be in surface-contact with the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) is attached to an outer surface of the evaporator case (110, 210, 310, 410, 510), characterized in that wherein the foil heater (130, 230, 330, 430, 530) extends along the edges of the evaporator case (110, 210, 310, 410, 510), and wherein the foil heater (130, 230, 330, 430, 530) is disposed not to overlap the cooling tube (120, 220, 320, 420, 520),wherein the evaporator case (110, 210, 310, 410, 510) is formed by bending two coupled case sheets (111, 112) to have a quadrangular box shape in which a lower surface portion, side surface portions (110b', 110b"), and an upper surface portion (110c', 110c") are provided and both sides thereof are open, and the foil heater (130, 230, 330, 430, 530) is attached to be in surface-contact with at least a portion of each of the lower surface portion, the side surface portions (110b', 110b"), and the upper surface portion (110c', 110c") to surround the evaporator case (110, 210, 310, 410, 510), wherein the foil heater (130, 230, 330, 430, 530) extends along the edges of the two coupled case sheets (111, 112) to surround the cooling tube (120, 220, 320, 420, 520).