<;P>;PROBLEM TO BE SOLVED: To provide a seaweed bed reef for promoting overgrowth of seaweed in the seaweed bed reef, and suppressing in a wide range, withered seashore occurring in a coastal zone. <;P>;SOLUTION: This seaweed bed reef is placed in the sea for suppressing a withered seashore phenomenon and thickly growing seaweed. The seaweed bed reef is equipped with a plurality of stone materials 4 which are set to surround a holding space S, packed in a frame 2 formed to allow seawater to circulate in the inside and outside, and the holding space S, and arranged to have a gap allowing seawater to circulate, and a humin supplyer 6 which is held adjacently to the stone materials 4 in the horizontal direction in the holding space S so as to let the current of seawater circulating passing the gap between the stone materials 4 touch, and is capable of releasing humin. <;P>;COPYRIGHT: (C)2010,JPO&INPIT