A clamping device for releasably holding a tool holder shank comprising: - a housing having a forward end, a rear end and a bore intersecting the forward end and extending rearwardly therefrom for receiving the tool holder shank in a mounting portion at the forward end of the bore; - a drawbar being mounted reciprocally movable inside the bore, along a longitudinal axis thereof, wherein the drawbar comprises, in a forward end, engagement means which are adapted to, when caused to assume a locking position, go into engagement with an engagement formation at the end of the tool holder shank; - a wedge engagement member securely arranged to the drawbar, wherein the wedge engagement member comprises a wedge engagement slide surface facing towards the forward end of the housing; and - a wedge comprising a first pressure receiving surface, a first wedge surface facing towards the rear end, and a second wedge surface facing towards the forward end, wherein the first and second wedge surfaces (11, 12) approach each other in a radial direction towards the longitudinal axis, wherein an aperture extends radially through a peripheral wall of the housing, characterised in that the aperture comprises an aperture slide surface facing towards the rear end of the housing, wherein - the wedge extends radially inwards from the outside of the housing into the aperture, wherein the first wedge surface contacts the wedge engagement slide surface, the second wedge surface contacts the aperture slide surface, and the first pressure receiving surface faces outwards from the housing, and wherein the clamping device further comprises: - a sleeve arranged on the outside of the peripheral wall of the housing around the circumference thereof and over the aperture, movable with respect to the housing in a first direction, wherein the sleeve, at its inner face, comprises a first pressure applying surface that faces inwards for contacting the pressure receiving surface, and has a radial distance to the longitudinal axis that increases in the first direction, wherein, the sleeve, the wedge, the wedge engagement member and the drawbar are such arranged that, when the sleeve is moved in the first direction, the first pressure applying surface presses the wedge radially inwards in the aperture by sliding and pressing against the first pressure receiving surface of the wedge, resulting in the first and second wedge surfaces (11, 12) sliding and pressing against the wedge engagement slide surface and the aperture slide surface, respectively, to force the drawbar to displace inside the bore towards the rear end, causing the engagement means to assume the locking position. - a housing having a forward end, a rear end and a bore intersecting the forward end and extending rearwardly therefrom for receiving the tool holder shank in a mounting portion at the forward end of the bore; - a drawbar being mounted reciprocally movable inside the bore, along a longitudinal axis thereof, wherein the drawbar comprises, in a forward end, engagement means which are adapted to, when caused to assume a locking position, go into engagement with an engagement formation at the end of the tool holder shank; - a wedge engagement member securely arranged to the drawbar, wherein the wedge engagement member comprises a wedge engagement slide surface facing towards the forward end of the housing; and - a wedge comprising a first pressure receiving surface, a first wedge surface facing towards the rear end, and a second wedge surface facing towards the forward end, wherein the first and second wedge surfaces (11, 12) approach each other in a radial direction towards the longitudinal axis, wherein an aperture extends radially through a peripheral wall of the housing, characterised in that the aperture comprises an aperture slide surface facing towards the rear end of the housing, wherein - the wedge extends radially inwards from the outside of the housing into the aperture, wherein the first wedge surface contacts the wedge engagement slide surface, the second wedge surface contacts the aperture slide surface, and the first pressure receiving surface faces outwards from the housing, - a sleeve arranged on the outside of the peripheral wall of the housing around the circumference thereof and over the aperture, movable with respect to the housing in a first direction, wherein the sleeve, at its inner face, comprises a first pressure applying surface that faces inwards for contacting the pressure receiving surface, and has a radial distance to the longitudinal axis that increases in the first direction, wherein, the sleeve, the wedge, the wedge engagement member and the drawbar are such arranged that, when the sleeve is moved in the first direction, the first pressure applying surface presses the wedge radially inwards in the aperture by sliding and pressing against the first pressure receiving surface of the wedge, resulting in the first and second wedge surfaces (11, 12) sliding and pressing against the wedge engagement slide surface and the aperture slide surface, respectively, to force the drawbar to displace inside the bore towards the rear end, causing the engagement means to assume the locking position.