To provide a ship for transportation capable of securing stability even substantially reducing ballast water.

Epoch making effect capable of reducing ballast water to 10% or less of the maximum loaded weight which can not be thought in a conventional ship can be developed, by a ship 1 for transportation characterized by having a ship bottom part 9 close to a semicircle submerged in water in the maximum loading condition, ship side parts 10, and a ship body part 12 which is wider than both the ends of the ship side parts, is water-tightly coupled to the ship side parts, and is for mounting cargoes in a crosssection in a direction perpendicular to the longitudinal direction of the ship.