To facilitate beam replacing work; and to suffice structural yield strength, in reconstructing a wooden building.

This joining hardware 2A and 2B are installed in an end part of an existing column 4 and a new beam 1, and the new beam 1 is lifted upward from the lower side, and is installed in a prescribed position between the columns 4, and the column and the beam are fixed by the joining hardware 2A and 2B. Since installation work of the beam 1 can be performed without being hindered by the existing ceiling, construction is facilitated, and required strength can be provided without arranging a cutout of a wooden frame by the joining hardware.