A surface treating apparatus has a first sheet containing unit; a second sheet containing unit; and a sheet driving unit to pull out an elongated sheet from the first sheet containing unit and move it to the second sheet containing unit as the apparatus moves on a surface to be treated. A sheet contacting member contacts one side of the sheet moving from the first sheet containing unit to the second sheet containing unit and brings the other side of the sheet into contact with the surface to be treated when the apparatus moves thereon. The elongated sheet is moved to wipe or apply wax or the like on the surface to be treated as the apparatus moves on the surface while renewing the portion of the sheet to be brought into contact with the surface when desired.