The invention hull (船體, 10) being outside the floor surface 11 is recessed in the front-rear direction central depression formed in, which is extended toward the rear left and right wider spacing of the grooves in the front recess 110 and the extension of as the stern extending to the rear of the groove (船尾) pushing the groove 100 is reduced groove 120 which narrows toward the right and left intervals in the direction and each of which is formed; Doedoe coupled in the longitudinal direction at a center of the driving groove 100, becoming increasingly longer in length in the vertical direction toward the rear, the shape of the lateral width is longer jidaga narrowing from a boundary point of the driving groove portion extended groove and reduction groove having a keel (200) and; Rolling prevention part having a rolling bumps 320 formed to protrude to the outer side of the driving groove opposite left and right boundary rolling prevention formed increasingly angled recessed upward to the hull outer side of the right and left direction from the groove 310 and prevent the rolling groove ( as 300) to about the hull for vessels with a speed-up and roll-over protection function, characterized in that made including, through which first, while holding a hull center through the driving groove and the keel reduces the resistance between the front and rear direction of the water may contribute to the linearity and increase the speed, and second, the contribution due to the pushing groove and the rolling prevention increases the resistance between the right and left direction of the water by way of a turning movement or when waves, tide to avoid the rolling (rolling) where the hull is inclined to the side due to the rolling it is effective to prevent the hull is overturned.