for raising and lowering boats in water the apparatus consists essentially of at least one float that is attached to the hull of the boat and is guided along the surface of the hull of the boat at least partially below water level when a force is applied to it preferably at least two floats that are permanently or displaceably attached to the apparatus support in the longitudinal direction and are provided on the side of the support which is intended to accommodate the hull of a boat the entire device is designed so it is adjustable in height and is connected to a stationary land based mooring point with an articulated joint this device is especially reliable for raising a boat out of the water and docking the boat above the water line without risking canting this result is possible in an inexpensive and very simple manner with the invention the usable width of the entire device is greatly reduced from previously known such devices application_number US 59736600 A description with reference now to the drawing the apparatus consists essentially of a lower central submersible support 1 that in turn consists of two parallel longitudinal bars 3 connected together by cross arms 4 at certain intervals keel pillar 5 is provided between longitudinal bars 3 and is designed so it is adjustable in the longitudinal direction between the longitudinal bars ship 39 s hull 2 with its underwater hull and keel 33 if any is then run onto support 1 there are a plurality of generally vertical pillars 6 that project upwardly from longitudinal bars 3 and have supporting plates 7 on the free upper ends to form a cradle means to support the hull of a boat appropriate.