A refrigerator comprising: a main body having an inner case which defines a storage space; an evaporator to supply cold air into the storage space; a grill pan assembly partitioning a space in which the evaporator is accommodated from the storage space; a cryogenic freezing compartment having an independent insulation space within the storage space and having an opened rear surface mounted on the grill pan assembly; a thermoelectric module assembly mounted on the grill pan assembly to supply the cold air into the cryogenic freezing compartment so that the inside of the cryogenic freezing compartment has a temperature less than that of the storage space, wherein the thermoelectric module assembly comprises: a thermoelectric module; a cold sink coming into contact with a heat absorption surface of the thermoelectric module and disposed to cool air in the cryogenic freezing compartment; a heat sink coming into contact with a heat generation surface of the thermoelectric module; an insulation material having a hole in which the thermoelectric module is accommodated and which thermally insulates the cold sink and the heat sink from each other, characterized in that the thermoelectric module assembly further comprises: a module housing being attached to the grill pan assembly, and a module fixing member mounted on a rear side of the inner case, the module housing including: an accommodation groove defining a space in which the heat sink, the insulation material, and the thermoelectric module are accommodated; and a spacer extending backwards from a rear surface thereof and coming in contact with the inner case, to maintain the thermoelectric module assembly spaced apart from the front surface of the inner case. a main body having an inner case which defines a storage space; an evaporator to supply cold air into the storage space; a grill pan assembly partitioning a space in which the evaporator is accommodated from the storage space; a cryogenic freezing compartment having an independent insulation space within the storage space and having an opened rear surface mounted on the grill pan assembly; a thermoelectric module assembly mounted on the grill pan assembly to supply the cold air into the cryogenic freezing compartment so that the inside of the cryogenic freezing compartment has a temperature less than that of the storage space, wherein the thermoelectric module assembly comprises: a thermoelectric module; a cold sink coming into contact with a heat absorption surface of the thermoelectric module and disposed to cool air in the cryogenic freezing compartment; a heat sink coming into contact with a heat generation surface of the thermoelectric module; an insulation material having a hole in which the thermoelectric module is accommodated and which thermally insulates the cold sink and the heat sink from each other, a thermoelectric module; a cold sink coming into contact with a heat absorption surface of the thermoelectric module and disposed to cool air in the cryogenic freezing compartment; a heat sink coming into contact with a heat generation surface of the thermoelectric module; an insulation material having a hole in which the thermoelectric module is accommodated and which thermally insulates the cold sink and the heat sink from each other, characterized in that the thermoelectric module assembly further comprises: a module housing being attached to the grill pan assembly, and a module fixing member mounted on a rear side of the inner case, the module housing including: an accommodation groove defining a space in which the heat sink, the insulation material, and the thermoelectric module are accommodated; and a spacer extending backwards from a rear surface thereof and coming in contact with the inner case, to maintain the thermoelectric module assembly spaced apart from the front surface of the inner case. a module housing being attached to the grill pan assembly, and a module fixing member mounted on a rear side of the inner case, the module housing including: an accommodation groove defining a space in which the heat sink, the insulation material, and the thermoelectric module are accommodated; and a spacer extending backwards from a rear surface thereof and coming in contact with the inner case, to maintain the thermoelectric module assembly spaced apart from the front surface of the inner case. an accommodation groove defining a space in which the heat sink, the insulation material, and the thermoelectric module are accommodated; and a spacer extending backwards from a rear surface thereof and coming in contact with the inner case, to maintain the thermoelectric module assembly spaced apart from the front surface of the inner case.