PROBLEM TO BE SOLVED: To provide a vegetation structural material capable of surely performing an afforestation of each plane not only a flat ground or a slackly inclined plane but also a steep incline plane or a vertical plane or optimally usable as a sound-proofing wall at a throughway. SOLUTION: This vegetation structural material uses a block body 1 having many voids 11 surrounded by a wall part 10 and the voids 11 are filled with a medium material 2 of plants.