To easily cope with diversity of corner angles of blocks and standardization in fabrication in a factory and transport the blocks without weight limitation and reduce the placing work of concrete in the construction site.

A precast corner block 2 provided with continuous two vertical walls 2a, 2a crossing at a right angle is arranged at the corner 1 of a retaining wall. Precast vertical plate blocks 3 provided with respective vertical walls 3a are arranged between the vertical walls 2a, 2a and the vertical walls 4a, 4a of L-shaped retaining wall blocks 4, 4. Respectively adjacent vertical walls 2a, 3a, 4a of respective blocks 2, 3, 4 are connected to each other and concrete is placed in the space surrounded by the lower end of the corner block 2, the lower ends of the vertical plate blocks 3, 3, and the bottoms 4b, 4b of the L- shaped retaining wall blocks 4, 4 in the construction site to form the bottom part 14 of the retaining wall corner 1.