The present invention provides a robot cleaner comprising: a main body which forms an outer appearance; a driving unit for moving the main body; a cleaning unit, installed at the lower portion of the main body, for sucking filth or dust on a floor surface or in the air; light emitting units which are installed at the lower portion of the main body and configured to externally emit light according the driving condition of the driving unit; and a controller for controlling the plurality of light emitting units so that the light emitting units emit light in forms different from each other according to each of a first driving condition where the main body is stopped, a second driving condition where the main body moves, and a third driving condition where the main body rotates.