A remote controller includes (i) an operating part having at least a key, (ii) a transmitter for transmitting a remote-control signal, (iii) a receiver for a receiving search signal, (iv) an informer for generating at least one of sound and vibration, and (v) a controller connected to these parts. The controller operates the transmitter according to an operation at the operating part, detects that the remote controller is in an abnormal operation state other than normal operation state according to an operation at the operating part, and operates the informer responsive to the search signal received by the receiver at least in the case of abnormal operation.