"Museum of Modem 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 geometry 1. Elevation: influence from Le Corbusier, similarity to Katsura Rikyu Imperial Villa and the development of Japanese pavilion in Paris Expo 2. Section: extraction of module 3. Perspective: relationship with Kamakura Hachimangu shrine 4. Landscape: comparison with Katsura Rikyu Imperial Villa