An infrared sensor is installed to one of the corners of a decorative panel to face different directions at the respective corners. A controller controls one of several air direction vanes and thus airflow out of one of air outlets and an air-conditioning apparatus to perform an operation, makes a determination of the installation position of the infrared sensor from one of several divided areas in which a temperature difference in floor surface between before and during an operation of the one of the air direction vanes equals or exceeds a specified value, a disposition position of the one of the air direction vanes, and an installation direction of the infrared sensor, and makes the one of the divided areas in which the temperature difference equals or exceeds the specified value correspond to the one of the air direction vanes to be controlled.