<;P>;PROBLEM TO BE SOLVED: To provide a member for increasing seaweed having a relatively simple structure, prevented from feeding damage by phytophagous shells and the like living at the sea bottom, and growing seaweeds. <;P>;SOLUTION: The member P for increasing seaweed is provided with a member body 1 growing the seaweeds and making the seaweeds take roots, and a pedestal member 2 holding the member body 1 on the sea bottom: wherein a gap g is formed between the vicinity of the outer periphery r of the member body 1 and the pedestal member 2. <;P>;COPYRIGHT: (C)2009,JPO&INPIT