A refrigerator comprising: a main body including a wall having an inner box , an outer box , and an insulation provided between the inner box and the outer box ; an upper refrigerator compartment and a lower freezer compartment formed by the wall ; a door rotatably coupled to the main body configured to open and close the refrigerator compartment , and including an ice-making chamber formed in a front surface of the door to be separated and insulated from the refrigerator compartment ; a refrigerator compartment cooler configured to generate cooling air to be supplied to the upper refrigerator compartment and disposed behind the upper refrigerator compartment ; a freezer compartment cooler to generate cooling air to be supplied to the lower freezer compartment and disposed behind the lower freezer compartment ; an ice-making chamber cooler configured to generate cooling air to be supplied to the ice-making chamber and disposed in a cooling chamber ; a cooling air duct configured to connect the ice-making chamber and the cooling chamber to supply the cooling air generated by the cooler to the ice-making chamber and to collect the air of the ice-making chamber ; characterized by further comprising: a blower fan disposed in the cooling chamber and configured to circulate cooling air between the ice-making chamber and the cooling chamber through the cooling air duct , wherein the cooling chamber is formed inside a cooling chamber case installed to be buried in the insulation of the wall . a main body including a wall having an inner box , an outer box , and an insulation provided between the inner box and the outer box ; an upper refrigerator compartment and a lower freezer compartment formed by the wall ; a door rotatably coupled to the main body configured to open and close the refrigerator compartment , and including an ice-making chamber formed in a front surface of the door to be separated and insulated from the refrigerator compartment ; a refrigerator compartment cooler configured to generate cooling air to be supplied to the upper refrigerator compartment and disposed behind the upper refrigerator compartment ; a freezer compartment cooler to generate cooling air to be supplied to the lower freezer compartment and disposed behind the lower freezer compartment ; an ice-making chamber cooler configured to generate cooling air to be supplied to the ice-making chamber and disposed in a cooling chamber ; a cooling air duct configured to connect the ice-making chamber and the cooling chamber to supply the cooling air generated by the cooler to the ice-making chamber and to collect the air of the ice-making chamber ; characterized by further comprising: a blower fan disposed in the cooling chamber and configured to circulate cooling air between the ice-making chamber and the cooling chamber through the cooling air duct , wherein the cooling chamber is formed inside a cooling chamber case installed to be buried in the insulation of the wall . a blower fan disposed in the cooling chamber and configured to circulate cooling air between the ice-making chamber and the cooling chamber through the cooling air duct , wherein the cooling chamber is formed inside a cooling chamber case installed to be buried in the insulation of the wall . <EOS>