Abstract: Patent for structure used in oyster cultivation, wherein the invention comprises a base (1), having four holes (2), where four pins are fixed, fixing the base to the bottom of the sea, base (1) has four other holes, wherein four vertical tubes (3) are fixed; after fixing tubes (3) to the base (1) of the structure, box (4) is settled over base (1), using tubes (3) as guides; afterwards, after putting oysters seeds in box (4), lid (5) is fixed over box (4), followed by sealing of lid (5), installed over box (4), in a way to avoid strange elements to the cultivation to access the oysters, then one end of rope (7) is fixed to ring (6) present in lid (5) and then the other end of rope (7) is fixed to counterweight (9), after passing this end of rope (7) by the hole present in buoy (8) (ring (6), fixed to one end of rope (7), buoy (8), counterweight (9), fixed to the other end of rope (7), help to maintain the structure stable in vertical position at the bottom of the sea during tide variations as well as during an