To form an ecosystem by providing upward through openings at a square platelike precast concrete wall body used in an almost vertical state in river civil work or the like.

Banking material 5 is filled at the back faces of a plurality of wall panels P, and a plurality of anchor reinforcing member fixtures 7 provided at the panels P, and anchor reinforcing members 4 are connected to construct an almost vertical wall. In the case of using this wall as a vegetation wall, vegetation pots are insert-fitted into through opening 11 to make plants propagate. In the case of using the wall as a river revetment, cobble stones or the like with a grain diameter larger than the through opening 11 are used as the banking material 5, and cavities of the banking part are used as fish nests. Environment gentle to nature and pleasing can therefore be created.