Outboard yacht pool, comprising a retractable structure , substantially polygonal-shaped and intended to be fixed to a point of a yacht hull, and a containment element linked to said structure and defining walls of said pool, wherein said structure comprises at least a first element , configured for being fixed laterally to the hull of said yacht, and connected to a plurality of lateral arms and a frontal arm , interconnected between them to create said polygon and configured for being moved by moving organs , wherein said structure is configured to switch, by means of said moving organs , between a first retracted configuration, wherein said pool is not in use and said structure is folded onto itself in a position adjacent to the hull of said yacht, and a second extended configuration, wherein said structure is projecting with respect to said hull and placed in proximity of the water surface, and wherein said containment element is extended and submerged in water, and connected below said structure , said plurality of lateral arms being linked to said at least first element by means of hinges , so that when said structure switches from said retracted configuration to said extended configuration, and vice versa, each lateral arm of said plurality of lateral arms rotates around said hinges by means of said moving organs , characterized in that sliding rails or guides are provided on the plurality of lateral arms , and in that the frontal arm is configured for translating by means of said moving organs along said sliding rails or guides , moving away from said first element of said structure , following the rotation of said plurality of lateral arms , so as to confer to said structure a polygonal shape. a retractable structure , substantially polygonal-shaped and intended to be fixed to a point of a yacht hull, and a containment element linked to said structure and defining walls of said pool, wherein said structure comprises at least a first element , configured for being fixed laterally to the hull of said yacht, and connected to a plurality of lateral arms and a frontal arm , interconnected between them to create said polygon and configured for being moved by moving organs , wherein said structure is configured to switch, by means of said moving organs , between a first retracted configuration, wherein said pool is not in use and said structure is folded onto itself in a position adjacent to the hull of said yacht, and a second extended configuration, wherein said structure is projecting with respect to said hull and placed in proximity of the water surface, and wherein said containment element is extended and submerged in water, and connected below said structure , said plurality of lateral arms being linked to said at least first element by means of hinges , so that when said structure switches from said retracted configuration to said extended configuration, and vice versa, each lateral arm of said plurality of lateral arms rotates around said hinges by means of said moving organs , characterized in that sliding rails or guides are provided on the plurality of lateral arms , and in that the frontal arm is configured for translating by means of said moving organs along said sliding rails or guides , moving away from said first element of said structure , following the rotation of said plurality of lateral arms , so as to confer to said structure a polygonal shape. <EOS>