Abstract: A shoplifting prevention device is provided which includes a marker that carries merchandise identifying information thereon, and a magnetic recording medium that is combined with the marker, and can be magnetized and demagnetized to permit recording and erasing of information by means of a magnetic field. The shoplifting prevention device is attached to an article of merchandise. In one preferred form of the invention, the marker consists of a cloth that carries merchandise identifying information, and the device including the cloth combined with the magnetic recording medium is attached to an article.