A refrigerator comprising: a duct dividing the inside of a storage compartment body (11, 12) into a storage compartment and an air channel, the duct having at least one main discharge port and at least one sub-discharge port; an air guide dividing the air channel into a first channel communicating with the at least one main discharge port and a second channel guiding air to the at least one sub-discharge port; a heat exchanger disposed in the first channel; and a fan suctioning air in the storage compartment and sending the air to the first channel, the duct includes a duct cover in which the at least one main discharge port is formed and an insulator, the duct cover includes a front cover, a first side cover and a second side cover, the first and second side covers (46, 47) being protruded rearward from the front cover, the second channel is formed between the air guide and the second side cover, characterized in that: in the duct cover further at least one sub-discharge port is formed, the insulator having an inner discharge hole communicating with the at least one main discharge port, the second side cover includes an upper guide spaced vertically from an upper end of the air guide and a side guide spaced horizontally from the air guide, to allow the air in the first channel to enter the second channel through between the upper end of the air guide and the upper guide and to flow through between the side guide and the air guide. a duct dividing the inside of a storage compartment body (11, 12) into a storage compartment and an air channel, the duct having at least one main discharge port and at least one sub-discharge port; an air guide dividing the air channel into a first channel communicating with the at least one main discharge port and a second channel guiding air to the at least one sub-discharge port; a heat exchanger disposed in the first channel; and a fan suctioning air in the storage compartment and sending the air to the first channel, the duct includes a duct cover in which the at least one main discharge port is formed and an insulator, the duct cover includes a front cover, a first side cover and a second side cover, the first and second side covers (46, 47) being protruded rearward from the front cover, the second channel is formed between the air guide and the second side cover, characterized in that: in the duct cover further at least one sub-discharge port is formed, the insulator having an inner discharge hole communicating with the at least one main discharge port, the second side cover includes an upper guide spaced vertically from an upper end of the air guide and a side guide spaced horizontally from the air guide, to allow the air in the first channel to enter the second channel through between the upper end of the air guide and the upper guide and to flow through between the side guide and the air guide. in the duct cover further at least one sub-discharge port is formed, the insulator having an inner discharge hole communicating with the at least one main discharge port, the second side cover includes an upper guide spaced vertically from an upper end of the air guide and a side guide spaced horizontally from the air guide, to allow the air in the first channel to enter the second channel through between the upper end of the air guide and the upper guide and to flow through between the side guide and the air guide.