The invention relates to a fixing device for fixing a tool, especially for fixing a parting-off grinder to a guiding device, especially a guiding carriage. The invention is characterised in that the fixing device (1) has a holder (3) with at least one hook element (4), said hook element (4) interacting with at least one fixing element (5) on a tool (1) in such a way that the tool (1) can be hung on the overlapping element(s) (4) with the fixing element(s) (5) and can be moved from a starting position to a fixed position by rotating about an axis.