The invention relates to a clamping device (1), particularly a machine vice (1), having a body element (2), a jaw (3) immovably attached thereto, and an oppositely placed movable jaw, for the displacement of which a drawbar (4) is provided, wherein the drawbar (4) is furnished with a bearing member on which the movable jaw is supported by means of a compression bar, and the movable bar is configured so that it may be arrested with the compression bar at varying distances from the fixed jaw, and a force amplifying arrangement (5) acting on the spindle is provided. The object of the present invention is to describe a clamping device that is as compactly configured as possible. The object is solved with a clamping device (1) according to the definition of the species wherein the force amplifying arrangement (5) includes at least one cylindrical tube (9) and at least two plungers (10, 11) that are movable in concentric cylinders, an outer compression plunger (10) and a clamping plunger (11)nullpreferably attached to the drawbar (4) by a plunger rodnulland wherein two compression chambers are provided, an outer, low-pressure chamber (12) and a high-pressure chamber (14) acting on the clamping plunger (11) from the direction of the drawbar, wherein a functional connection is established between the two plungers in such manner that at least one rod (18) having a smaller diameter than the diameter of the plungers and which is connected to the outer compression plunger (10) acts on the high-pressure chamber (14), which is filled with pressurising medium, preferably oil or liquid grease.