PURPOSE: A stern structure for an unmanned sailing ship is provided to protect a propeller of the stern from the foreign material of surface or underwater in sailing the ship by forming a gateway of the water into the shape of the gills of the shark. CONSTITUTION: The water flowing into the driving propeller(20) of the stern is flowed in through the inlet port of both sides of the stern and is discharged through the mesh transom stern. The inlet port(10) of the water flowing into the driving propeller of the stern is formed into the gills of the shark shape in both sides of the stern. The inflow of the foreign material of surface or underwater is prevented.
