Abstract: A wiping device for a magnetic tape cassette is provided with an elastic main body having a securing element cooperable with a cassette housing so that the main body can be mounted to and removed from the housing from the outside of the cassette without dismantling the secured upper and lower cases. A wiping or cleaning/erasing element is supported by the main body and has a curved operation surface. When the main body is mounted to the housing, and the magnetic tape is loaded to an operation position by a magnetic recording and reproducing apparatus, the magnetizable surface of the magnetic tape contacts an effective area of the curved operation surface.