Bioimpedance measuring device for determining composition data of the human body with several electrodes and with measuring circuits, including alternating current sources, voltage measuring circuits and a control and evaluation unit, which is prepared to apply, according to predetermined measurement programs, respectively, through two specific electrodes for the respective measurement program, an alternating current from the alternating current sources in the body, and to determine with other two electrodes in different members the resulting voltages with the voltage measurement circuits, and to determine from them the impedance of body segments, two hand positioning bodies being provided, which are formed and provided, respectively, with two electrodes (3, 4； 7, 8) in such a way that a user, when placing his hands, comes into contact with each hand with two electrodes in the respective hand placement body, each hand placement body presenting a hand bearing surface (1； 5) to support an inner surface of the hand, each supporting surface of the hand (1； 5) being provided with an electrically insulating separation rib (2； 6), which extends along a part of its length , in order to interpose between the middle finger and the ring finger when the hand rests on the support surface of the hand, and an electrode (3, 4； 7, 8) with a longitudinal extension along the support surface of the hand, characterized in that the separation rib (2； 6) extends along the support surface of the hand so much that it separates the two electrodes (3, 4； 7, 8) to each other of a body for placing the hands along its entire longitudinal extension, so that when the hand is resting on the support surface of the hand and the separation rib (2； 6) gets in the middle space between the middle finger and the finger annular, one of the two electrodes may only come into contact with the little finger and / or the ring finger of the hand and the other of the two electrodes may come into contact only with
