PURPOSE: A floating structure is provided to reduce the permeation of water to a deck by moving a body mooring to the sea bottom with external force. CONSTITUTION: A floating structure comprises a body(100), a mooring rope, a mooring-rope fixing unit(110), and a guide unit(120). The body floats on the water. The mooring rope connects the body to the anchor of the sea bottom. The mooring-rope fixing unit is movably arranged on the body and fixes the mooring rope. The guide unit guides the movement of the mooring-rope fixing unit. The guide unit is a guide rail. The mooring-rope fixing unit freely moves along the guide unit.
