The invention relates to an apparatus for treatment, in particular physiotherapeutic treatment, of a part of the human body, in particular an arm, comprising a holder for fixing the body part to be treated, comprising a traction element, which acts on the body part with a predeterminable tension. The tension is applied by one or more weights acting on the traction element via a tension transmitter, it being possible for the tensile force acting on the body part to be varied or stopped at the beginning, during and/or at the end of the treatment by a counteracting force applied by a motor.