The invention relates to a cool air controlling apparatus for concentrically cooling a region in a refrigerator where a new load is stored. The apparatus comprises: the first cool air duct provided along a compartment wall of a refrigerator with a certain length for allowing the cool air introduced from a blowing chamber to flow therethrough; the second cool air duct having a variable length provided downward from a front end of the first cool air duct; length adjusting means connected to the second cool air duct for adjusting the length of the second cool air duct; and rotation adjusting means attached to a lower end of the second cool air duct for carrying out rotation and injecting the cool air. The entire temperature distribution is uniformly maintained in a refrigerating chamber thereby greatly reducing power consumption.