"Museum of Modern Art, Kamakura" designed by Junzo SAKAKURA is one of the most representative modern buildings in Japan. The purpose of this paper is to clarify the proportion by means of the analysis on the golden ratio and the geometry based on the design process. The methods of analysis are as follows: extraction of module, golden ratio and element of geometric figure. The paper shows that design of "Museum of Modern Art, Kamakura" was composed by various geometries through the analysis on Plane figure.
