Abstract: The invention concerns a connection device for providing mechanical and electric connection between a multi-conductor cable and a well-probe, comprising a separation disk through which pass a plurality of pins, connected on the probe side to a female electric connector and at the opposite side to a hollow rods connected electrically to the conductors of the cable, an insulating sleeve having an end-piece for fixing the cable, inside which the connections of the rods to the conductors of the cable are made, the sleeve is fitted on the end of the probe body and is fixed thereto by a nut and a lock-nut providing, at the same time, sealed insulation between the inside of the body and the sleeve and interconnection of the electric conductors of the cable with those of the probe.