Robot vacuum cleaner

Disclosed is a robot vacuum cleaner, comprising: a vacuum cleaner main body having a control part and a drive wheel of which driving is controlled by the control part; a bumper mounted on a bumper mounting part formed in a front portion of the vacuum cleaner main body and configured to be movable inward by an external force; and a cliff sensor mounted inside an opening which is open downward at a bottom portion of the vacuum cleaner main body and sensing a downward terrain, wherein the bumper is arranged to cover the cliff sensor in a state in which the bumper is moved inward by the external force.