A refrigerator comprising: a cabinet including a freezing chamber provided above a refrigerating chamber; and an evaporator installed in the freezing chamber, wherein the evaporator includes: an evaporator case having a box shape with two sides thereof opened and forming a storage space for food therein; a cooling tube formed in a predetermined pattern on the evaporator case and filled with a refrigerant for cooling therein; a sheath heater disposed to be spaced apart from a left side surface portion and a lower surface portion of the evaporator case outwards at a predetermined distance and generating heat when power is applied such that heat for defrosting is transferred to the evaporator case wherein the evaporator case includes a fixing member allowing the sheath heater to be caught therein and fixed to a predetermined position, wherein the fixing member protrudes from the evaporator case to surround the sheath heater together with the evaporator case, and the sheath heater is supported by the fixing member and spaced apart from the evaporator case at a predetermined distance, characterized in that the fixing member includes: a bent portion formed as a portion of the evaporator case is cut and bent outwards; and a recess portion recessed inwards from the bent portion to prepare a space for receiving the sheath heater and in that the sheath heater is disposed not to overlap the cooling tube to prevent direct heat transfer to the refrigerant filling the cooling tube. a cabinet including a freezing chamber provided above a refrigerating chamber; and an evaporator installed in the freezing chamber, wherein the evaporator includes: an evaporator case having a box shape with two sides thereof opened and forming a storage space for food therein; a cooling tube formed in a predetermined pattern on the evaporator case and filled with a refrigerant for cooling therein; a sheath heater disposed to be spaced apart from a left side surface portion and a lower surface portion of the evaporator case outwards at a predetermined distance and generating heat when power is applied such that heat for defrosting is transferred to the evaporator case wherein the evaporator case includes a fixing member allowing the sheath heater to be caught therein and fixed to a predetermined position, wherein the fixing member protrudes from the evaporator case to surround the sheath heater together with the evaporator case, and the sheath heater is supported by the fixing member and spaced apart from the evaporator case at a predetermined distance, characterized in that the fixing member includes: a bent portion formed as a portion of the evaporator case is cut and bent outwards; and a recess portion recessed inwards from the bent portion to prepare a space for receiving the sheath heater and in that the sheath heater is disposed not to overlap the cooling tube to prevent direct heat transfer to the refrigerant filling the cooling tube. an evaporator case having a box shape with two sides thereof opened and forming a storage space for food therein; a cooling tube formed in a predetermined pattern on the evaporator case and filled with a refrigerant for cooling therein; a sheath heater disposed to be spaced apart from a left side surface portion and a lower surface portion of the evaporator case outwards at a predetermined distance and generating heat when power is applied such that heat for defrosting is transferred to the evaporator case wherein the evaporator case includes a fixing member allowing the sheath heater to be caught therein and fixed to a predetermined position, wherein the fixing member protrudes from the evaporator case to surround the sheath heater together with the evaporator case, and the sheath heater is supported by the fixing member and spaced apart from the evaporator case at a predetermined distance, characterized in that the fixing member includes: a bent portion formed as a portion of the evaporator case is cut and bent outwards; and a recess portion recessed inwards from the bent portion to prepare a space for receiving the sheath heater and in that the sheath heater is disposed not to overlap the cooling tube to prevent direct heat transfer to the refrigerant filling the cooling tube. a bent portion formed as a portion of the evaporator case is cut and bent outwards; and a recess portion recessed inwards from the bent portion to prepare a space for receiving the sheath heater and in that the sheath heater is disposed not to overlap the cooling tube to prevent direct heat transfer to the refrigerant filling the cooling tube.