Disclosed herein is a heat exchanger according to the spirit of the present disclosure which includes an inlet pipe, an outlet pipe and a connection pipe configured to connect a first header with a second header. In the heat exchanger, since a refrigerant exchanges heat while flowing in only one of an upward direction and a downward direction, circulation of the refrigerant may be improved, and since each of the first header and the second header includes a plurality of divided chambers formed therein, and the refrigerant may be repeatedly distributed according to a flow of the refrigerant passing through each chamber, distribution and mixing of the refrigerant may be improved.