The purpose of this study is to analyze the historical evolution of the riverside common space, Uo-kashi in Nihonbashi from the point of view of the land use and land ownership. The official documents of kashichi licenses in 1882 and 1889, and kashichi maps in 1882 were used for analyzing the original characteristics of Uo-kashi before the modernization. The history of kashi is divided into four periods; pre-Shikukaisei, post-Shikukaisei, post-Big Kanto Earthquake and post-WWII. Three points were clarified. Firstly, there existed diverse open spaces in Kashi up until 1920’s, and it took important roles to connect the river and city. Secondly, after Big Kanto Earthquake the fish market removed, the original open space system rapidly disappeared. Thirdly, in spite of those situations, the land ownership of kashichi had remained to the public-sector until 1978. This means kashi had been regarded as the important common spaces, and the users should get the permission from the public. This system continued for over 350 years. It was only 30 years ago that this unique system had collapsed.
