To provide a vessel capable of sailing even in light-water draft, and sailing on forward, backward, lateral movement, right turning round, left turning round, and turning round on its spot.

In the vessel, a freely rotatable propeller can be installed at a several places of recessed part on both sides according to use application of the vessel and installed so that the propeller does not protruded from a ship bottom by making the hull structure be a reverse convex shape.