Disclosed is a chucking device 1 for a tool, said device comprising a tool receiving element 2, a collet 5 for clamping the tool, said collet being inserted in an opening 9 in the tool receiving element 2, a clamping nut 3 for axially displacing the collet 5 in relation to the tool receiving element 2 and a pressure piece 4 which is arranged between the clamping nut 3 and the collet and is rotatably mounted in relation to the clamping nut 3, by means of which piece the collet 5 can be axially displaced in relation to the tool receiving element 2 by the clamping nut 3. To permit a tool shank to be securely clamped in and released from the collet 5, even under extremely high clamping forces, the pressure piece 4 has coupling elements 12 for a torsion-proof connection to corresponding mating elements 13 of the tool receiving element 2.