A manipulator for positioning a test head, particularly at a tester is provided with a positioner for positioning the test head three-dimensionally and forming a mount. The manipulator comprises furthermore a cradle to which the test head can be secured and which is connected to the positioner. The cradle is connected to a plate comprising at least one first supporting point. The plate is pivotally mounted at the first supporting point about a first axis. To achieve, on the one hand, precise adjustment and, on the other, a certain compliance, the first supporting point is movable between a starting position and an end position relative to the mount in overcoming the effect of a return force.