A refrigerator including: a refrigerator body; an evaporator installed in the refrigerator body for exchanging heat with air in the refrigerator body; a blower fan for blowing the air cooled while passing through the evaporator; and a barrier for vertically partitioning an inner space of the refrigerator body into a freezing chamber and a chilling chamber, the chilling chamber being defined below the freezing chamber; a chilling chamber door for opening or closing the chilling chamber, characterized in that the refrigerator further comprises: an ice machine installed on a rear surface of the chilling chamber door, the ice machine including: an ice maker making ice; an ice bank storing the ice made by the ice maker; and an ice-making chamber accommodating the ice maker and the ice bank, the ice-making chamber including: an insulating case having cold air inflow hole (261, 361) and a cold air discharge hole (271, 381); and an insulating cover for covering a front of the insulating case; a freezing air duct (260, 360) connected with the ice machine through the cold air inflow hole (261, 361), for supplying the cold air blown by the blower fan to the freezing chamber; a chilling air duct branched off from the freezing air duct (260, 360) and connected to the chilling chamber, for supplying the cold air blown by the blower fan to the chilling chamber; and a cold air return duct (270, 370) formed in the barrier and connected with the ice machine through the cold air discharge hole (271, 381) to allow the cold air in the ice-making chamber to return to the evaporator. a refrigerator body; an evaporator installed in the refrigerator body for exchanging heat with air in the refrigerator body; a blower fan for blowing the air cooled while passing through the evaporator; and a barrier for vertically partitioning an inner space of the refrigerator body into a freezing chamber and a chilling chamber, the chilling chamber being defined below the freezing chamber; a chilling chamber door for opening or closing the chilling chamber, an ice machine installed on a rear surface of the chilling chamber door, the ice machine including: an ice maker making ice; an ice bank storing the ice made by the ice maker; and an ice-making chamber accommodating the ice maker and the ice an ice maker making ice; an ice bank storing the ice made by the ice maker; and an ice-making chamber accommodating the ice maker and the ice bank, the ice-making chamber including: an insulating case having cold air inflow hole (261, 361) and a cold air discharge hole (271, 381); and an insulating cover for covering a front of the insulating case; an insulating case having cold air inflow hole (261, 361) and a cold air discharge hole (271, 381); and an insulating cover for covering a front of the insulating case; a freezing air duct (260, 360) connected with the ice machine through the cold air inflow hole (261, 361), for supplying the cold air blown by the blower fan to the freezing chamber; a chilling air duct branched off from the freezing air duct (260, 360) and connected to the chilling chamber, for supplying the cold air blown by the blower fan to the chilling chamber; and a cold air return duct (270, 370) formed in the barrier and connected with the ice machine through the cold air discharge hole (271, 381) to allow the cold air in the ice-making chamber to return to the evaporator.