To easily exchange a wood by inserting a wood provide with a slit in the longitudinal direction into a hole having a partition member for partitioning in the diameter direction in such a manner the slit engages with the partition member.

The center of a cylindrical body 4a is partitioned by a partition plate 4b in the diameter direction, and an annular projection 5 is provided on the outer periphery of the cylindrical body 4a to form a wood erection tool 2. A slit 6 passing through an axial center is axially provided on the lower end of a wood 3 so that an interior side is wider than the edge. The wood erection tool 2 is buried in a concrete block 1 used for a wooden settlement floor or the like. The wood 3 is inserted in the inside of the cylindrical body 4a until the partition plate 4b of the wood erection tool 2 enters the interior end of the slit 6 to be erected on the wood erection tool 2. Thereby in the case where the wood 3 rots, it can be easily exchanged for the new wood 3.