<p>A drillship is disclosed. The drillship of the present invention comprises: a mud module installed on a main deck; and a drill floor installed on the main deck. The drillship can lower the height of the mud module by coupling the base part of the mud module to the main deck while maintaining contact between the the base part and the main deck, and lower the center of gravity of a hull by downwardly arranging the drill floor at a predetermined height.</p>
