An outdoor unit of an air conditioner comprising: a compressor configured to compress refrigerant; a condenser configured to condense the refrigerant discharged from the compressor; a control box provided with an electronic component configured to control the outdoor unit, wherein the electronic component includes a heating unit; and a cooling unit configured to cool the electronic component by making contact with the heating unit, wherein the cooling unit comprises: a heat radiating member having one side thereof configured to contact the heating unit; and a refrigerant pipe configured to penetrate through the heat radiating member and configured to allow refrigerant to move therein, and wherein the control box further comprises: a case having a space in which the electronic component is placed, wherein the cooling unit is detachably coupled to the case, and wherein the heat radiating member further comprises: a body placed on the outside of the case; and a contact unit provided on one side of the body and configured to extend from the body inward of the control box to penetrate through the case to be in contact with the heating unit. a compressor configured to compress refrigerant; a condenser configured to condense the refrigerant discharged from the compressor; a control box provided with an electronic component configured to control the outdoor unit, wherein the electronic component includes a heating unit; and a cooling unit configured to cool the electronic component by making contact with the heating unit, wherein the cooling unit comprises: a heat radiating member having one side thereof configured to contact the heating unit; and a refrigerant pipe configured to penetrate through the heat radiating member and configured to allow refrigerant to move therein, and wherein the control box further comprises: a case having a space in which the electronic component is placed, wherein the cooling unit is detachably coupled to the case, and wherein the heat radiating member further comprises: a body placed on the outside of the case; and a contact unit provided on one side of the body and configured to extend from the body inward of the control box to penetrate through the case to be in contact with the heating unit. a heat radiating member having one side thereof configured to contact the heating unit; and a refrigerant pipe configured to penetrate through the heat radiating member and configured to allow refrigerant to move therein, and wherein the control box further comprises: a case having a space in which the electronic component is placed, wherein the cooling unit is detachably coupled to the case, and wherein the heat radiating member further comprises: a body placed on the outside of the case; and a contact unit provided on one side of the body and configured to extend from the body inward of the control box to penetrate through the case to be in contact with the heating unit. a case having a space in which the electronic component is placed, wherein the cooling unit is detachably coupled to the case, and wherein the heat radiating member further comprises: a body placed on the outside of the case; and a contact unit provided on one side of the body and configured to extend from the body inward of the control box to penetrate through the case to be in contact with the heating unit. a body placed on the outside of the case; and a contact unit provided on one side of the body and configured to extend from the body inward of the control box to penetrate through the case to be in contact with the heating unit.