A refrigerator, comprising: a refrigerator body formed with a storage chamber to store foods; a door configured to open or close the storage chamber; an ice maker mounted on the door; an ice making chamber cover accommodated with the ice maker thereinside and formed with a cool air inlet port for inhaling cool air at an upper portion thereof; and an ice bank provided at a lower portion of the ice maker to store ice, wherein the ice maker comprises: a first guide coupled to a lower portion of the ice maker to guide cool air to pass through the lower portion of the ice maker; and a second guide provided at an upper side of the ice maker to guide cool air inhaled through the cool air inlet port to be branched off and flowed into the upper and lower portions of the ice maker, wherein the ice maker is provided with a side wall and disposed to be separated from an inner wall of the door such that an upper cool air passage is formed at one side of the side wall, wherein the first guide is provided with a body disposed to be separated from a lower side of the ice maker to form a lower cool air passage between a bottom surface of the ice maker and the body, characterized in that the second guide is formed with a tubular shaped body provided with a cool air inlet portion for inhaling cool air at an upper side thereof and a cool air outlet portion for exhausting the cool air at a lower side thereof and has a flow area reduced along the movement direction of the cool air, said second guide being disposed above the side wall of the ice maker and the upper cool air passage in order to guide the cool air exhausted from the cool air outlet portion to be branched off and flowed into the upper portion of the icemaker and the upper cool air passage. a refrigerator body formed with a storage chamber to store foods; a door configured to open or close the storage chamber; an ice maker mounted on the door; an ice making chamber cover accommodated with the ice maker thereinside and formed with a cool air inlet port for inhaling cool air at an upper portion thereof; and an ice bank provided at a lower portion of the ice maker to store ice, a first guide coupled to a lower portion of the ice maker to guide cool air to pass through the lower portion of the ice maker; and a second guide provided at an upper side of the ice maker to guide cool air inhaled through the cool air inlet port to be branched off and flowed into the upper and lower portions of the ice maker, wherein the ice maker is provided with a side wall and disposed to be separated from an inner wall of the door such that an upper cool air passage is formed at one side of the side wall, wherein the first guide is provided with a body disposed to be separated from a lower side of the ice maker to form a lower cool air passage between a bottom surface of the ice maker and the body, characterized in that the second guide is formed with a tubular shaped body provided with a cool air inlet portion for inhaling cool air at an upper side thereof and a cool air outlet portion for exhausting the cool air at a lower side thereof and has a flow area reduced along the movement direction of the cool air, said second guide being disposed above the side wall of the ice maker and the upper cool air passage in order to guide the cool air exhausted from the cool air outlet portion to be branched off and flowed into the upper portion of the icemaker and the upper cool air passage.