Abstract
The author classified classical mutural community support systems specific for poor islander whom are on the brink of ruin. His central concerns are on “Island of Poverty;” in Japan, which resources for restoration and redevelolpment are the opportunity to use land on the uninhabited very tiny islet, and sea surrounding. These are commons or a quasi commons of mother island's community, sometimes even which are houses they use and live in. He classified also historical and managerial differences between “Island of Poverty; Uu-jima, Oominase-jima, Ote-shima and Yuri-jima;” and similar systems in detail. These differences in detail are mainly based on the documents and new fact findings by his field-work.
