Abstract: In a surgical operation table having an upper structure for supporting the body of a patient, separably supported by a lower structure on a part vertically movable relative to the remaining parts thereof and rotatable around the longitudinal and transverse axes of the table, a guiding device comprising a guiding pin and a guiding bush combined respectively with mating halves of an electric connector and a locking device comprising an electrically driven locking screw and a nut are provided on the engaging surfaces of the upper structure and the above mentioned part of the lower structure, which are driven through a two-line electric circuit of a reduced voltage.