PURPOSE: To effectively increase the flexural rigidity of a wall plate section and a bottom plate section and the slip preventing performance of a retaining wall and improve the retaining wall performance, reliability, and workability.

CONSTITUTION: Continuous projections 3, 13, 23 are protruded in series toward the wall plate height Y and bottom plate width direction X on the back face of a wall plate section 1 and the lower face of a bottom plate section 2 of an RC retaining wall formed into an L-shaped cross section and having the wall plate section 1 and bottom plate section 2. Multiple continuous projections 3, 13, 23 are arranged at an interval in the length direction Z of the retaining wall. The lateral width of the continuous projections 13, 23 is formed into a narrow width (s) toward the tip sections from the connection section 4 between the wall plate section 1 and the bottom plate section 2.