A double hull structure is applied in all cargo holds, and from No.2 thru No.4 cargo holds are square holds. Overhang of the cross deck is minimized in order to improve the cargo handling efficiency. Also, the fuel tank is double hulled and arranged in a location with consideration for environment. The cargo capacity of 37,000 ton in the top category is assured, and it can be navigated safely only with the exclusive ballast tank even with heavy ballast in case of foul weather without flooding to the cargo hold.