Yoshinari KOUCHI, who was born in Hiroshima on June 13 in 1913, graduated from Yokohama engineering college in 1935. He studied under Junpei NAKAMURA, who was the famous architect and educator. After his graduation, he worked under Mumoru YAMADA, who was one of the most famous rationalistic architects in Modern Japan, and he went to Manchuria for working as an architect at architecture section in Ministry of Communications Financial Bureau. Since July in 1939, he had designed buildings as an engineer at architecture section in General Bureau of Post Affairs, Manchoukuo. After the Second World War, he returned to Japan and made a great contribution to reconstruction of Hiroshima City by designing many buildings at AKATUKI architecture design institute. In 1951, he established KOUCHI YOSHINARI architecture design institute. He was not only an energetic architect based in Hiroshima but also the person who was active in various fields of the academic studies and the building administration.