A cleaning device in which toner remaining on an image reproducing support through an electrostatic reproducing process is cleaned by a fur brush and then the toner having adhered to the fur brush is recovered by an electrically biased roller, the fur brush having a brush core formed of a conductive material and the brush core being grounded or biased with the polarity opposite to that of bias voltage applied to the roller. The fur brush is formed as a conductive brush and grounded through a non-linear resistance element. The fur brush is formed of a semiconductive material.