In a cold air supply apparatus of a refrigerator, by forming a cold air path for discharging cold air from the rear and side surfaces of a chilling chamber to distribute cold air from the rear and side surfaces of the chilling chamber selectively by using a damper, the apparatus includes a cold air discharge duct installed at the upper portion of a chilling chamber; a side cold air path connected with a certain side of the cold air discharge duct, formed at the side wall of the chilling chamber and guiding cold air to the side of the chilling chamber; and a damper installed on a certain side of the cold air discharge duct in order to open/close the cold air supply hole, the side cold air path and both the side cold air path and the cold air discharge duct selectively.