A cooling air supplying device of a refrigerator is provided. The cooling air supplying device of the refrigerator includes a cooling air supply path formed in the upper portion of a mullion wall for separating a freezing chamber from the chilling chamber, the cooling air supply path for supplying the cooling air blown from a blast fan arranged in the freezing chamber to the chilling chamber, a discharge duct connected to the cooling air supply path and installed in the upper portion of the chilling chamber, the discharge duct for discharging the cooling air from the upper portion of the chilling chamber, cooling air guide channels connected to the discharge duct, the cooling air guide channels for guiding the cooling air to one side or both sides of the chilling chamber, and cooling air discharge units connected to the cooling air guide channels and formed on one side surface or the both side surfaces of a main frame, the cooling air discharge units for discharging the cooling air from the side surface of the chilling chamber into the respective cells divided by the shelves. |