In the Great East Japan Earthquake that occurred in March 2011, many buildings suffered from seawater immersion caused by the tsunami. Saito's study revealed that corrosion progresses on metal plate that experienced seawater immersion 1). However, the detailed mechanism of corrosion progresses has not yet been clarified. Therefore, in this study, salinity which is one of causes of corrosion was focused on, and we tried to find seawater infiltration into timbers. In this study, salt content and moisture content of the timber immersed in seawater were measured. The immersion period was 15 minutes, 12 hours, 3 days. After immersion, the specimen was taken out from the aqueous solution, and cut into 20 mm thickness discs from the place where the metal plate was attached and the place where the metal plate was not attached. The cut out disk was further divided into 25 pieces. Salt content and moisture content of each pieces were measured. As a result, the following was clarified. 1. Seawater permeated deeply at the nail hole as the immersion period became longer. 2. Seawater also permeated into the second layer of the disc which is not at the nail hole of the specimen immersed for three days.

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