Provides bottom structure and twin sketch line of twin skeg line that can improve propulsion efficiency. A pair of skegs 15L and 15R provided on the stern side of the bottom 13 at intervals in the hull width direction and a pair of skegs 15L and 15R provided separately on the stern side of the pair of skegs 15L and 15R, And an inclined surface 131 formed on the bottom 13 between the pair of skews 15L and 15R and inclined upward toward the stern side of the propeller. The transverse section of the inclined plane 131 is formed in a flat shape along the width direction of the hull at the first position B and at a second position A on the aft side than the first position B A pair of concave portions 131b which are spaced apart from each other in the hull width direction and which are upwardly concave and a convex portion 131a which is provided between the pair of concave portions 131b and which is convex downward, .
展开▼
