To provide a float having a main line internally threaded therethrough capable of changing one float from a water surface float into an underwater float by regulating a sinker load, changing the centroidal balance of the float and changing the float into an oblique float, a just transverse float, etc., further fitting a water resistance plate in the float, thereby more facilitating the catching of the tide and responsive to a change in the tide by the one float.

This float is composed by installing a protruding edge 2 for a water surface float at the end on the lateral side on the water surface of a vertical pipe 1 for passing a main line therethrough, freely fitting a water surface float 3 in a bulged form, winding a winding sinker 5 around the underwater lateral end and freely detachably fitting a cylinder 6 for securing the winding sinker 5 to the lower part of the winding sinker 5.