A cool air supply structure of a storage receptacle for a refrigerator, which includes a main body having a storage space provided therein and a door for selectively opening or closing the storage space, the cool air supply structure, comprising: one or more receptacle casings detachably installed into the storage space and having a mounting space provided therein so that a storage receptacle is moved into or out of the mounting space; and a channel provided in each of the receptacle casings so that cool air flows in the channel, wherein food received in the storage receptacle is indirectly cooled by the cool air flowing in the channel. According to the present invention, the food received in the storage receptacle of a refrigerator can be kept fresh with a simple configuration.