This study demonstrated integrative assessment of mangrove resource use in Iriomote Island in order to seek sustainable use of the resources. First, literature survey and interviews of stakeholders in Iriomote Island revealed that the ways of mangrove use had shifted from direct ones (use for raw materials such as tannin and dye) to indirect ones (like for ecotourism). Second, we showed economic merits and cultural aspects as well as the environmental reasons mentioned above are the major reasons that ecotourism as an indirect use of mangrove use was employed and established. Finally, based on the results of the integrative assessment, we argue that further efforts are necessary to conserve the mangrove resources and their landscape under the current practice of ecotourism. Specifically, we address the importance of creating future visions of Iriomote Island through expanding collaborative networks among Okinawa and Amami islands, and by facilitating participation of local people in the visioning processes. These inclusive processes will contribute to not only the sustainable use of mangrove resource use but also enhancement of wellbeing of people in Iriomote Island.