PURPOSE: An air cavity vessel is provided to reduce the costs and time to build a vessel by forming an air cavity on a bottom part without design change. CONSTITUTION: An air cavity vessel comprises longitudinal and traverse partition members(110,120), a longitudinal partition(111), and an air supplying part. The longitudinal partition member is protruded from a bottom part(101) and attached to both side of the bottom part in order to divide the bottom part in vertical direction. The traverse partition member is expanded in a width direction of the bottom.
