<;P>;PROBLEM TO BE SOLVED: To provide a seaweed seed/seedling-attaching tool facilitating transplanting of seaweed seeds and seedlings to an alga reef in creation of marine forest. <;P>;SOLUTION: The seaweed seed/seedling-attaching tool includes a holder member 13 enabling seed and seedling chips 5 to which seaweed seeds and seedlings 4 are attached to grow, and a base member 9 formed to be attached to the alga reef 1. The holder member can be detachably attached to the base member. <;P>;COPYRIGHT: (C)2010,JPO&INPIT