An air conditioner comprising: - an air conditioner body that performs maintenance operation after air conditioning is operated; and - a remote controller that controls the operation of the air conditioner body, wherein - the air conditioner body includes -- a body receiver that receives a control signal for controlling the operation from the remote controller, -- a body transmitter that transmits operation information for the air conditioner body to the remote controller, and -- a maintenance-operation information generator that generates contents of the maintenance operation and its operation time as the operation information, and - the remote controller includes -- a remote-controller transmitter that transmits a control signal for controlling the operation to the air conditioner body, -- a remote-controller receiver that receives operation information for the air conditioner body transmitted from the air conditioner body, and -- a display unit that displays the contents of maintenance operation and the operation time included in the operation information received by the remote-controller receiver, wherein when the remote-controller transmitter transmits a control signal to stop the operation to the air conditioner body, the body receiver receives the control signal, the maintenance-operation information generator generates the contents of the maintenance operation and its operation time as the operation information, while when operation information is transmitted from the body transmitter, the remote-controller receiver receives the operation information and displays the contents of the maintenance operation and its operation time on the display unit, characterized in that the display unit displays, when the maintenance operation is automatically started after air-conditioning operation by the air conditioner body is stopped, the contents of the maintenance operation and time required for the maintenance operation. - an air conditioner body that performs maintenance operation after air conditioning is operated; and - a remote controller that controls the operation of the air conditioner body, wherein - the air conditioner body includes -- a body receiver that receives a control signal for controlling the operation from the remote controller, -- a body transmitter that transmits operation information for the air conditioner body to the remote controller, and -- a maintenance-operation information generator that generates contents of the maintenance operation and its operation time as the operation information, and -- a body receiver that receives a control signal for controlling the operation from the remote controller, -- a body transmitter that transmits operation information for the air conditioner body to the remote controller, and -- a maintenance-operation information generator that generates contents of the maintenance operation and its operation time as the operation information, and - the remote controller includes -- a remote-controller transmitter that transmits a control signal for controlling the operation to the air conditioner body, -- a remote-controller receiver that receives operation information for the air conditioner body transmitted from the air conditioner body, and -- a display unit that displays the contents of maintenance operation and the operation time included in the operation information received by the remote-controller receiver, wherein when the remote-controller transmitter transmits a control signal to stop the operation to the air conditioner body, the body receiver receives the control signal, the maintenance-operation information generator generates the contents of the maintenance operation and its operation time as the operation information, while when operation information is transmitted from the body transmitter, the remote-controller receiver receives the operation information and displays the contents of the maintenance operation and its operation time on the display unit, -- a remote-controller transmitter that transmits a control signal for controlling the operation to the air conditioner body, -- a remote-controller receiver that receives operation information for the air conditioner body transmitted from the air conditioner body, and -- a display unit that displays the contents of maintenance operation and the operation time included in the operation information received by the remote-controller receiver, wherein when the remote-controller transmitter transmits a control signal to stop the operation to the air conditioner body, the body receiver receives the control signal, the maintenance-operation information generator generates the contents of the maintenance operation and its operation time as the operation information, while when operation information is transmitted from the body transmitter, the remote-controller receiver receives the operation information and displays the contents of the maintenance operation and its operation time on the display unit,