Disclosed is a vacuum cleaner. The vacuum cleaner includes a suction nozzle housing, an agitator provided within the suction nozzle housing, and a suction channel guiding air sucked into the suction nozzle housing to a dust collector, the agitator includes a body rotatably installed in the suction nozzle housing, brush members disposed on the body in parallel with the center of rotation of the body and combined with the body so as to be fixed, and auxiliary members disposed on the body in parallel with the center of rotation of the body and combined with the body so as to be movable when the body is rotated, and a protrusion overlapping with parts of the brush members and contacting the brush members when the body is rotated is provided in the suction channel.