PURPOSE: To provide a durable floating structure and a floating fish bank by reducing the area of projection in the horizontal direction under stormy weather or in the open sea.

CONSTITUTION: In a floating body 1 moored on an anchor 5 at the sea bottom, a mooring point 3 which connects a mooring rope 2 and the floating body is eccentric in the upstream from a center of the floating body, and its eccentric position is in the scope of 5-15%, of the length of the floating body. The mooring rope 2 passes through the floating body 1 on the back, and the mooring point 3 is at a position deviated from the center of the floating body. Furthermore, a ringlike frame or a rail provided on the back of the floating body is movably provided. Moreover, a floating fish bank is constituted in such a way that a ring is provided on the outside of the floating body 1 and a shaded object is provided on a flat face which is constituted by the ring and the floating body. Furthermore, artificial sea weed is attached to a bottom face of either of such floating structure or floating fish bank.