In a concentrated cooling apparatus of a refrigerator capable of improving cooling efficiency and performance by discharging cold air through only a nozzle at a high-temperature load occurred region among nozzles installed at a side wall of a chilling chamber in order to discharge cold air intensively and preventing a nozzle and an infrared sensor installed at the side wall of the chilling chamber from being icebound, the apparatus includes a housing respectively installed at more than one cold air guide path formed at a side wall of a chilling chamber so as to guide cold air to the side wall of the chilling chamber; a nozzle rotationally supported by the housing and jetting cold air intensively to a high-temperature load occurred region when a high-temperature load occurs inside the chilling chamber; an infrared sensor installed at the front of the nozzle and sensing the high-temperature load occurred region while being rotated with the nozzle; and a nozzle cover installed at the upper surface of the housing, supporting the nozzle so as to expose the upper surface of the nozzle and opening/closing the cold air jet hole by the rotation of the nozzle.