To provide a block wall toppling prevention pile which contributes to increased support strength thereof with respect to the ground surface, and the improved stability thereof when supporting a block wall, and to provide a block wall construction method.

The block wall toppling prevention pile K supports the block wall H set up by arranging a plurality of blocks 50 in series on the ground in the horizontal and vertical directions, and prevents toppling of the block wall H. The block wall toppling prevention pile is formed of an embedded member 1 driven and embedded in the ground, and a support reinforcement 30 connected to the embedded member 1 via a connection means and inserted into the blocks 50. The embedded member 1 consists of a driven reinforcement 10 formed like a rod and driven into the ground, and a plurality of fins 20 radially protruded from an external surface of the driven reinforcement 10 about a center shaft of the same.