In the era of world-wide ocean development, we must accumulate the marine and meteological information in the Japanese economical ocean area up to 200 nautical
miles off the coasts in order to gain natural resources and utilize the ocean space in the area. A large discus-buoy is one of observation facilities which have been developed for the observation of marine climate in the see deeper than 100m. However, the cost of its manufgacture and installation is very expensive and its transportation is not easy. Therefore, a ship-shaped buoy has been newly developed as a substitute of the discus-buoy. The cost of its manufacture is cheeper than
that of the discusbuoy, and it seems to have a good stability in seas.
　The present paper invesitgates the characteristics of the motions of the ship-shaped buoy in waves and winds to confirm the applicability of the ship-shaped buoy to the facility for the observation of marine climate by field observation as well as model tests. The investigation clarifies that ship-shaped buoy can be employed as one of observation facilities, because the heave motions of the ship-shaped buoy can estimate the wave profiles with a good accuracy.