To provide an air conditioner that displays the whole content of energy saving advice at once on the interface part of a remote controller and incorporates an acceleration sensor in the remote controller, so that pre-operation information from a main body can be received instantly only by raising the remote controller. An air conditioner includes an almost box-shaped main body, a controller, a remote controller, and a communication part. The almost box-shaped main body has a suction port to take in room air and a blowing port to blow out conditioned air. The controller controls operation of the air conditioner. The remote controller includes a remote controller main body, an acceleration sensor provided in the remote controller main body, and an interface display part constituted by a full-dot liquid crystal display, and allows a user to control operation of the air conditioner. The communication part performs bidirectional communication between the controller and the remote controller. When the user raises the remote controller, pre-operation information is displayed on the interface display part.