A robot cleaner of the present disclosure comprises a main body configured to travel in a cleaning zone and to suction a foreign substance on a floor in the cleaning zone, an image sensor provided on the main body and configured to obtain an image of a predetermined area at a front side of the main body, a first light source provided on the main body and configured to emit a first pattern of light to a first sub-area of the predetermined area and a second light source provided on the main body at a position below the first light source and configured to emit a second pattern of light to a second sub-area of the predetermined area, the first sub-area being located lower than the second sub-area.