Abstract
The Imperial Palace was formerly Edo Castle, which was originaly built in 1457 according to the plans of Dokan Ota, and then came under the control of Ieyasu Tokugawa in 1590. It was constructed as the residential castle of the Tokugawa Shogunate, and almostly completed in 1636. The present stone walls suffered from many disasters, and were repaired on all such occasions. After Meiji era, it was badly damaged by the Kanto Earthquake in 1923. Up to the present, it was unknown what kind of method was applied to the repair-works for the stone walls at the time. As a result of recent investigation on the archives of repair-works after the Earthquake at the Ministry of Imperial Household, we made clear that the stone walls suffered from the Earthquake had been restored by the wet masonry in the interior structure, although they look like the dry masonry in appearance.
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