A heat exchanger comprising: - a plurality of heat transfer tubes, the heat transfer tubes being disposed with a predetermined spacing from each other in an up and down direction; and - a distributor configured to distribute refrigerant to the plurality of the heat transfer tubes, wherein the distributor includes - a body part including a first inlet for refrigerant, and a first passage in which refrigerant entering through the first inlet flows upward, and - a plurality of flow-splitting parts each including a second passage, each flow-splitting part communicating at a second inlet with the first passage and communicating at an outlet with one of the heat transfer tubes, and - wherein the second inlets of at least two of the flow-splitting parts each communicate with the first passage at a location above the first inlet, - wherein among the heat transfer tubes each communicating with the outlet of the flow-splitting part of which the second inlet communicates with the first passage at a location above the first inlet, at least a first one of the heat transfer tubes from top is defined as a first heat transfer tube, - wherein among the heat transfer tubes each communicating with the outlet of the flow-splitting part of which the second inlet communicates with the first passage at a location above the first inlet, the heat transfer tube positioned below the first heat transfer tube is defined as a second heat transfer tube, - wherein the flow-splitting part of which the outlet communicates with the first heat transfer tube is defined as a first flow-splitting part, - wherein the flow-splitting part of which the outlet communicates with the second heat transfer tube is defined as a second flow-splitting part, and - characterized in that the second inlet of the first flow-splitting part communicates with the first passage at a location below the second inlet of the second flow-splitting part that communicates with the first passage at a highest location. - a plurality of heat transfer tubes, the heat transfer tubes being disposed with a predetermined spacing from each other in an up and down direction; and - a distributor configured to distribute refrigerant to the plurality of the heat transfer tubes, wherein the distributor includes - a body part including a first inlet for refrigerant, and a first passage in which refrigerant entering through the first inlet flows upward, and - a plurality of flow-splitting parts each including a second passage, each flow-splitting part communicating at a second inlet with the first passage and communicating at an outlet with one of the heat transfer tubes, and - a body part including a first inlet for refrigerant, and a first passage in which refrigerant entering through the first inlet flows upward, and - a plurality of flow-splitting parts each including a second passage, each flow-splitting part communicating at a second inlet with the first passage and communicating at an outlet with one of the heat transfer tubes, and - wherein the second inlets of at least two of the flow-splitting parts each communicate with the first passage at a location above the first inlet, - wherein among the heat transfer tubes each communicating with the outlet of the flow-splitting part of which the second inlet communicates with the first passage at a location above the first inlet, at least a first one of the heat transfer tubes from top is defined as a first heat transfer tube, - wherein among the heat transfer tubes each communicating with the outlet of the flow-splitting part of which the second inlet communicates with the first passage at a location above the first inlet, the heat transfer tube positioned below the first heat transfer tube is defined as a second heat transfer tube, - wherein the flow-splitting part of which the outlet communicates with the first heat transfer tube is defined as a first flow-splitting part, - wherein the flow-splitting part of which the outlet communicates with the second heat transfer tube is defined as a second flow-splitting part, and - characterized in that the second inlet of the first flow-splitting part communicates with the first passage at a location below the second inlet of the second flow-splitting part that communicates with the first passage at a highest location.