To effectively reduce hull resistance resulting from stern longitudinal vortex generated laterally to each skeg part and to raise impellent capability of a twin skeg ship, in the twin skeg ship with a lateral pair of skeg parts prepared in a stern part and support a propeller shaft, respectively.

The twin skeg ship 1 includes: a lateral pair of skeg parts 6 which are separated with spacing and prepared in a ship width direction at the stern part 4 of the hull 3 and support a propeller shaft 5, respectively; and a lateral pair of propellers 8 installed at a rear end of the propeller shaft 5, respectively. In the ship, a fin 10 which has an elevation angle α to the stern longitudinal vortex S generated inside of each skeg part 6 is prepared at an inner wall surface 6b of each skeg part 6 in the same height position as vortex center C of the stern longitudinal vortex S generated inside each skeg part 6, respectively.