To provide the column-uplift preventive reinforcing structure of a wooden building in which bonding power with a hardener is obtained sufficiently by forming an overhang section at the lower end section of a reinforcing pile and the usage of the hardener is reduced simultaneously, forming the overhang section in this case by a simple working.

A pile pit 20 is dug to the peripheral ground surface 2 of an existing column 1 to be reinforced, the inside of the pile pit is filled with the hardener 4 and a pile base section 5 in which the periphery of the tubular reinforcing pile 3 is hardened is formed and a section between the reinforcing pile and the existing column is connected by a connecting member 6. The overhang 30 in the outer peripheral direction is formed at the lower end section while a closing section 31 is formed at the lower end section of the reinforcing pile by flatly crushing the lower end section of the reinforcing pile in the diametral direction.