An air conditioner comprising: an electronic unit comprising a control component for driving a refrigerant cycle; and a cooling tube through which a refrigerant for cooling the electronic unit flows, the cooling tube being coupled to one side of the electronic unit , wherein the electronic unit comprises: an electronic case having a through part ; an electronic board to which the control component is coupled, the electronic board being disposed within the electronic case ; a heat transfer plate disposed to contact the control component, the heat transfer plate being coupled to the electronic case ; a heat-sink plate to which the cooling tube is coupled, the heat-sink plate contacting the heat transfer plate through the through part ; fixing guides spacing the electronic board apart from the heat transfer plate , being disposed on the same side of the heat transfer plate but spaced from each other at opposite ends; characterised by first coupling members configured to couple the fixing guides and the heat transfer plate to the inner surface of the electronic case , wherein the first coupling members pass through the respective fixing guide and the heat transfer plate so as to couple them to the electronic case . an electronic unit comprising a control component for driving a refrigerant cycle; and a cooling tube through which a refrigerant for cooling the electronic unit flows, the cooling tube being coupled to one side of the electronic unit , wherein the electronic unit comprises: an electronic case having a through part ; an electronic board to which the control component is coupled, the electronic board being disposed within the electronic case ; a heat transfer plate disposed to contact the control component, the heat transfer plate being coupled to the electronic case ; a heat-sink plate to which the cooling tube is coupled, the heat-sink plate contacting the heat transfer plate through the through part ; fixing guides spacing the electronic board apart from the heat transfer plate , being disposed on the same side of the heat transfer plate but spaced from each other at opposite ends; characterised by first coupling members configured to couple the fixing guides and the heat transfer plate to the inner surface of the electronic case , wherein the first coupling members pass through the respective fixing guide and the heat transfer plate so as to couple them to the electronic case . an electronic case having a through part ; an electronic board to which the control component is coupled, the electronic board being disposed within the electronic case ; a heat transfer plate disposed to contact the control component, the heat transfer plate being coupled to the electronic case ; a heat-sink plate to which the cooling tube is coupled, the heat-sink plate contacting the heat transfer plate through the through part ; fixing guides spacing the electronic board apart from the heat transfer plate , being disposed on the same side of the heat transfer plate but spaced from each other at opposite ends; characterised by first coupling members configured to couple the fixing guides and the heat transfer plate to the inner surface of the electronic case , wherein the first coupling members pass through the respective fixing guide and the heat transfer plate so as to couple them to the electronic case . <EOS>