To provide a mooring system without breaking a mooring rope, allowing a hull to drift or damaging the other object when attacked by a tsunami.

A space between the hull 1 and a mooring wharf is connected with a cushioning rope 3 interposed by a cushioning material 32, and a space between the hull 1 and a marker buoy 4 is connected with a mooring rope 5, a space between the marker buoy 4 and a seabed chain 9 is connected with a cushioning rope 6 interposed by a cushioning material 62, and the other end of the seabed chain 9 is connected to a seabed block 7. Furthermore, a plurality of groups of the mooring systems of the small vessels are provided so as to share the seabed block 7 present between the adjoining systems.