Russo-Japanese War (February 1904 - September 1905) caused casualty of over 200,000 people in Japan and enormous damages to over 120,000 families of the victims. This war was the world`s first war of attrition focusing on hand-to-hand combat. In addition, the tragic consequences were recorded substantially by the army soldiers who fought. Natsume Soseki (1867 - 1916) is a writer who became a literary giant for his major works of middle and later period of modern literature. However, in the early period, he left a new style poem 『Jyoogunkou』(『Teikokubungaku』, May 1905) and a novel 『shyuminoiden』(『Teikokubungaku』, January 1906) based on the Russo- Japanese War. This text explores these two works and proves the literary circles and social circumstances related to the Russo-Japanese War. Through this approach, the unique attitude of Soseki toward this war is examined in detail. In conclusion, the attitude of Soseki toward the Russo-Japanese War always includes the following two components: Weariness of war and approval of war. The former is expressed relatively stronger. However, since his attempt to clearly express his weariness of war is lacking, his attitude toward that spirit doesn`t seem to be quite strong.