PURPOSE: To increase the strength of a horizontal direction of the anchor bolt by a method wherein a foundation hole for the anchor bolt to be installed in the concrete foundation is made as small as possible, the split anchor bolt is driven vertically in the foundation hole and resin is poured into the foundation hole.

CONSTITUTION: The foundation hole 3 slightly larger than the diameter of anchor bolt 2 is dug in the concrete foundation 1. The anchor bolt 2 having the split 2a is driven into the foundation hole 3. The resin 4 is poured into the gap between the anchor bolt 2 and the foundation hole 3 to fix the bolt.