A robot cleaner includes a motor, a rotating-shaft member, and a rotation member coupled to the rotating-shaft member and including a cleaning member coupling configured to be detachably coupled to a plurality of cleaning members. The motor, rotating-shaft member, and the rotation member are configured so that the motor is drivable to rotate the rotating-shaft member and thereby cause the rotation member to move in a first direction or a second direction opposite to the first direction, along a longitudinal direction of the rotating-shaft member. In a case that the rotation member moves in the first direction with the cleaning member coupling detachably coupled to the plurality of cleaning members, at least one cleaning member of the plurality of cleaning members becomes detached, and is thereby released, from the cleaning member coupling.