A ceiling-concealed air-conditioning apparatus, comprising: an air-conditioning apparatus main body having an air inlet formed in a lower portion thereof; an electrical component box arranged on a side of the air-conditioning apparatus main body, and includes a switch, the switch being arranged on a lower portion of the electrical component box, and configured to operate the air-conditioning apparatus main body, and; a decorative panel arranged below the air-conditioning apparatus main body and the electrical component box to serve as a decorative surface, the decorative panel including a suction grille arranged so as to be openable and closable, and configured to cover the air inlet; and a side panel arranged below the electrical component box, the side panel including an openable and closable cover arranged so as to be openable and closable, the side panel being configured to cover the switch when the openable and closable cover is closed, the openable and closable cover comprising a protruding portion protruding on a side portion of the openable and closable cover on the suction grille side, wherein the openable and closable cover is configured to open by a pull of the protruding portion downward under a state in which the openable and closable cover is closed, and wherein the protruding portion is covered by the suction grille when the suction grille is closed, and the protruding portion is exposed to an outside when the suction grille is opened, characterized in that the side panel has a first opening portion (4a1) formed therein, wherein the openable and closable cover includes a hook shank portion formed on a back surface thereof, wherein the hook shank portion has a recess recessed upward under the state in which the openable and closable cover is closed, and wherein the recess of the hook shank portion is hooked on a peripheral wall (4a2) of the first opening portion (4a1) so that the openable and closable cover is supported on the side panel so as to be turnable. an air-conditioning apparatus main body having an air inlet formed in a lower portion thereof; an electrical component box arranged on a side of the air-conditioning apparatus main body, and includes a switch, the switch being arranged on a lower portion of the electrical component box, and configured to operate the air-conditioning apparatus main body, and; a decorative panel arranged below the air-conditioning apparatus main body and the electrical component box to serve as a decorative surface, the decorative panel including a suction grille arranged so as to be openable and closable, and configured to cover the air inlet; and a side panel arranged below the electrical component box, the side panel including an openable and closable cover arranged so as to be openable and closable, the side panel being configured to cover the switch when the openable and closable cover is closed, the openable and closable cover comprising a protruding portion protruding on a side portion of the openable and closable cover on the suction grille side, a suction grille arranged so as to be openable and closable, and configured to cover the air inlet; and a side panel arranged below the electrical component box, the side panel including an openable and closable cover arranged so as to be openable and closable, the side panel being configured to cover the switch when the openable and closable cover is closed, the openable and closable cover comprising a protruding portion protruding on a side portion of the openable and closable cover on the suction grille side, wherein the openable and closable cover is configured to open by a pull of the protruding portion downward under a state in which the openable and closable cover is closed, and wherein the protruding portion is covered by the suction grille when the suction grille is closed, and the protruding portion is exposed to an outside when the suction grille is opened, characterized in that the side panel has a first opening portion (4a1) formed therein, wherein the openable and closable cover includes a hook shank portion formed on a back surface thereof, wherein the hook shank portion has a recess recessed upward under the state in which the openable and closable cover is closed, and wherein the recess of the hook shank portion is hooked on a peripheral wall (4a2) of the first opening portion (4a1) so that the openable and closable cover is supported on the side panel so as to be turnable.