A vacuum cleaner (11) to be provided is capable of making a side brush (19) projecting from an outer circumferential surface of a body case (12) retreat readily and reliably when the side brush (19) contacts an obstacle. The vacuum cleaner (11) includes the body case (12) having an outer circumferential surface (34) formed along either a circular arc or a polygon. The vacuum cleaner (11) includes a drive wheel to allow travel of the body case (12) on a cleaning target surface. The vacuum cleaner (11) includes the side brush (19) provided to the body case (12) so as to be movable in a certain direction. The side brush (19) is to project from the outer circumferential surface (34) of the body case (12) by an amount that changes in response to movement. The side brush (19) includes a brush body (41) that is movable so as to retreat toward the outer circumferential surface (34) of the body case (12) in response to external force acting in a direction crossing the certain direction. The side brush (19) includes a cleaning unit (43) rotatably provided to the brush body (41). The cleaning unit (43) is to rotate to clean the cleaning target surface.
