A refrigerator, comprising: a body including a freezer compartment positioned under a refrigerator compartment; a separation wall separating the freezer compartment and the refrigerator compartment; a cooling device mounted on the top of the separation wall at a bottom portion of the refrigerator compartment; and an air passage having an intake port and a discharge port that are configured to communicate with the freezer compartment to respectively guide cold air to and from the cooling device, wherein the cooling device includes: a case having an open front surface; a cover coupled to the case to selectively open and close the open front surface of the case; an agitating assembly installed in the case and configured to swing about a rotational axis that extends in a longitudinal direction of the case; an agitating mechanism operably coupled to the agitating assembly to swing the agitating assembly through a predetermined arc about the rotational axis; and a fan assembly mounted at a rear end of the case for supplying cold air into the case, characterized in that the air passage includes: an intake duct having a first end that communicates with the freezer compartment and a second end connected to the fan assembly; a cold air supply passage extending along a bottom of the case, from the fan assembly to the front of the case; an intake grill mounted on the underside of the case at an area corresponding to the front of the cold air supply passage; and a return duct having a first end that communicates with the discharge port formed at the bottom of the case and a second end that communicates with the freezer compartment, wherein the cold air supply passage extends from the fan assembly to the intake grill through the space between the case and the bottom of the refrigerator compartment without passing through the separation wall. a body including a freezer compartment positioned under a refrigerator compartment; a separation wall separating the freezer compartment and the refrigerator compartment; a cooling device mounted on the top of the separation wall at a bottom portion of the refrigerator compartment; and an air passage having an intake port and a discharge port that are configured to communicate with the freezer compartment to respectively guide cold air to and from the cooling device, wherein the cooling device includes: a case having an open front surface; a cover coupled to the case to selectively open and close the open front surface of the case; an agitating assembly installed in the case and configured to swing about a rotational axis that extends in a longitudinal direction of the case; an agitating mechanism operably coupled to the agitating assembly to swing the agitating assembly through a predetermined arc about the rotational axis; and a fan assembly mounted at a rear end of the case for supplying cold air into the case, a case having an open front surface; a cover coupled to the case to selectively open and close the open front surface of the case; an agitating assembly installed in the case and configured to swing about a rotational axis that extends in a longitudinal direction of the case; an agitating mechanism operably coupled to the agitating assembly to swing the agitating assembly through a predetermined arc about the rotational axis; and a fan assembly mounted at a rear end of the case for supplying cold air into the case, characterized in that the air passage includes: an intake duct having a first end that communicates with the freezer compartment and a second end connected to the fan assembly; a cold air supply passage extending along a bottom of the case, from the fan assembly to the front of the case; an intake grill mounted on the underside of the case at an area corresponding to the front of the cold air supply passage; and a return duct having a first end that communicates with the discharge port formed at the bottom of the case and a second end that communicates with the freezer compartment, wherein the cold air supply passage extends from the fan assembly to the intake grill through the space between the case and the bottom of the refrigerator compartment without passing through the separation wall. an intake duct having a first end that communicates with the freezer compartment and a second end connected to the fan assembly; a cold air supply passage extending along a bottom of the case, from the fan assembly to the front of the case; an intake grill mounted on the underside of the case at an area corresponding to the front of the cold air supply passage; and a return duct having a first end that communicates with the discharge port formed at the bottom of the case and a second end that communicates with the freezer compartment, wherein the cold air supply passage extends from the fan assembly to the intake grill through the space between the case and the bottom of the refrigerator compartment without passing through the separation wall.