A magnet-holder for attaching an object to a glass pane has two parts of a holder which can be placed on mutually opposed boundary faces of said glass pane and are biased towards one another by a magnetic-force apparatus. In addition, that part of the holder which is disposed on the inner side of the glass pane has a contact plate whose side that faces towards the glass pane carries a plurality of elastic holding cups which can cling to the pane.