Abstract
Public involvement in planning of seacoast affairs is executed in Ohshinden area, Nakatsu Portin Oita Prefecture. Large well-reserved mud flat spreads around the port. People enjoy its scenery andcreatures, and coastal fishery utilizes the ecosystem. The local government and people organize the meeting to discuss utilization and conservation of the seacoast in this area. Comparative consideration on civil engineering works and medical care in terms of informed consent, and the role of local governmentsand function of these meeting are discussed.