Recently in Japan, the durability of metal joint in wooden structures become important. Revised Building Standard Law was enacted in 2000 and Act on the Promotion of Popularization of Long-life Quality Housing was enacted in 2008 in Japan. Since then, the durability of the metal joints in the wooden houses becomes important. But there are not any detailed regulation for the durability of the metal joint in the wooden structures in Japan. In this study, nails driven into woods, -dried with high temperature, dried with middle temperature, dried with low temperature, natural-dried, and non-dried-, was put in high temperature and high humidity environment in long-term, for clarifying the influence of drying condition of wood on rusting of nails. After that, the shear test was conducted, and the rust on nails was removed for evaluating the mass loss by corrosion. As a result, follows were confirmed. 1. The shear strength of the nail is highest when the weight remaining ratio is about 95%-80%, and when rust progressed, the shear strength decrease. 2. The nails driven into sapwood rust remarkably than the nails driven into heartwood. 3. The nails -driven into woods with natural-dried or non-tried rust remarkably than dried with high temperature, dried with middle temperature, or dried with low temperature.

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