Historical relations between Japan and Africa have been explored by several historians for a few decades. During Edo era(17th-19th century), some African people seemed to be brought to Deshima (Dejima) island of Nagasaki as servants of Dutch merchants, and after the Meiji Restoration a lot of Japanese reached to Africa as travelers, merchants and laborers. In pre-war Showa period (from late 1920s to 1930s), Japanese people intended not only to start business in Africa but also to immigrate as then government had been struggling for supremacy for international relationship. The study of Japan-Africa Relations has served information as such to Japanese society, however it is also expected to contribute to see Japanese society itself. This article aims at illustrating how Japan-Africa relations have affected on Japanese people and society, through providing several case studies on Nagasaki of western Kyushu.