To provide a retaining wall block which is basically composed of two kinds of retaining wall blocks and can be adjusted and laid at a desired connection angle freely and easily in accordance with the condition of a construction site.

The lower parts of both retaining wall blocks 1 and 11 to be connected are connected pivotally with a vertical shaft 7 at a part where a projection 6 is fitted in a cutout recession 15 so that the lower parts are rotatable. The upper parts of both retaining wall blocks 1 and 11 are connected via a connecting plate 18 having one end fixed to one retaining wall block 1 and the other end temporarily fixed with a temporary fixing bolt 24 to the other retaining wall block 11 connected to the retaining wall block 1. After adjustment of a connecting angle, the bolt 24 is fully tightened to connect both retaining wall blocks 1 and 11 together.