BOAT SHELL

PROBLEM TO BE SOLVED: To provide a boat shell having such a structure as canceling the waves generated when the boat moves at a water surface. SOLUTION: A boat shell comprises a main shell part and at least one draining member 1 provided in the longitudinal direction at the bottom surface of the main shell part, wherein the displacing member 1 is formed symmetrically about the longitudinal axis of the boat and has a coasting surface 2 adjacent to at least the two longitudinally stretching side faces of the member 1, wherein the coasting surface 2 is shaped undulately at least in the longitudinal direction of the boat shell. The weight of displaced water from the member 1 corresponds substantially to the gross weight of the boat, and thereby the coasting surface 2 is positioned approximately horizontally on the water surface or near it. The form of undulation takes a position approximately 180 degs. dislocated with respect to natural waves generated by the displacing member 1, and thereby the generated natural waves are substantially canceled in the course of the boat advancing at the water surface.