A robot cleaner comprising: a main unit including a fan motor and a dust collector, and having an inlet arranged in a bottom of the main unit; and a cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') arranged in the bottom of the main unit, extending to a front side of the main unit from a side of the inlet, to guide foreign materials on a floor to the inlet, wherein the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') comprises: a first cleaning tool (30, 50, 60, 70) that extends from the side of the inlet to a left front side of the main unit to guide foreign materials on the floor to the inlet; and a second cleaning tool (30', 50', 60', 70') that extends from the side of the inlet to a right front side of the main unit to guide foreign materials on the floor to the inlet, and the first and second cleaning tools are positioned with respect to each other to form a V-shape, wherein the first cleaning tool (30, 50, 60, 70) and the second cleaning tool (30', 50', 60', 70') are closer together at the side of the inlet than at the front side of the main unit, wherein the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') is arranged to be movable by an external force pressing on the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') as the robot cleaner cleans the floor, and characterised in that the inlet comprises a door (49a, 49b), which moves in sync with the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70'). a main unit including a fan motor and a dust collector, and having an inlet arranged in a bottom of the main unit; and a cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') arranged in the bottom of the main unit, extending to a front side of the main unit from a side of the inlet, to guide foreign materials on a floor to the inlet, wherein the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') comprises: a first cleaning tool (30, 50, 60, 70) that extends from the side of the inlet to a left front side of the main unit to guide foreign materials on the floor to the inlet; and a second cleaning tool (30', 50', 60', 70') that extends from the side of the inlet to a right front side of the main unit to guide foreign materials on the floor to the inlet, and the first and second cleaning tools are positioned with respect to each other to form a V-shape, wherein the first cleaning tool (30, 50, 60, 70) and the second cleaning tool (30', 50', 60', 70') are closer together at the side of the inlet than at the front side of the main unit, wherein the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') is arranged to be movable by an external force pressing on the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') as the robot cleaner cleans the floor, and characterised in that the inlet comprises a door (49a, 49b), which moves in sync with the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70'). a first cleaning tool (30, 50, 60, 70) that extends from the side of the inlet to a left front side of the main unit to guide foreign materials on the floor to the inlet; and a second cleaning tool (30', 50', 60', 70') that extends from the side of the inlet to a right front side of the main unit to guide foreign materials on the floor to the inlet, and the first and second cleaning tools are positioned with respect to each other to form a V-shape, wherein the first cleaning tool (30, 50, 60, 70) and the second cleaning tool (30', 50', 60', 70') are closer together at the side of the inlet than at the front side of the main unit, wherein the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') is arranged to be movable by an external force pressing on the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70') as the robot cleaner cleans the floor, and characterised in that the inlet comprises a door (49a, 49b), which moves in sync with the cleaning tool (30, 30', 50, 50', 60, 60', 70, 70').