A robot cleaner includes: a base body forming a bottom part of a cleaner body; a first wheel module and a second wheel module installed to be spaced apart from each other, and configured to moveably support the base body; a suction motor module and a battery module provided between the first and second wheel modules; and a suction nozzle module provided at a front side of the suction motor module and the battery module, and configured to suck air of a region to be cleaned, wherein a plurality of module accommodation portions which are open towards a lower side of the robot cleaner are formed at the base body, and wherein the first wheel module, the second wheel module, the suction motor module, the battery module, and the suction nozzle module are inserted into the module accommodation portions, respectively, in parallel to each other.