In a vessel, a first hull bottom (21) formed with a hull bottom (13) located at a centerline (C) of a hull (11) in a width direction inclined upward in a backward direction and a second hull bottom (22) formed to make an angle equal to or larger than an angle parallel to a design draft (S) and equal to or smaller than an angle of a backward extending line from the first hull bottom (21) continuously to the first hull bottom (21) at a position moved forward by a predetermined distance L set in advance from a stern end (12a) are provided, by which the vessel resistance can be reduced at the time of navigation.