Retaining wall device, comprising at least one first retaining wall member (5) and a support (3, 4) for it, wherein the first retaining wall member and the support have first and second longitudinal edges, respectively, extending in longitudinal direction of the retaining wall, which longitudinal edges have been formed for connection to each other by a tilting or rotary motion about one or several axes that are parallel to the longitudinal edges, wherein the longitudinal edge that is opposite the first longitudinal edge (8) of the first retaining wall member is designed corresponding to the second longitudinal edge, wherein the first and second longitudinal edges can be provided with stop surfaces for limiting the tilting motion to mutual abutment of the first and second longitudinal edges in a retaining position of the first retainin wall member.