摘要:The article provides an analysis of some subjects considering the role of financial groups with vertical line of command directing to members of one clan (zaibatsu) in process of preparing Japan to Russo-Japanese war 1904–1905 as a key part of setting up the whole vector of development of Russian Empire’ politics in Far East. Authors distinguishes factors, which caused zaibatsu’s participation in preparing Japan to Russo-Japanese war, highlights main vectors of its activity during the pre-war period, and also distinguishes some consequences of the beginning of Russo-Japanese war for economic activity’s participants, like zaibatsu, its emergence, for example. Authors also analyses legal measures Japanese government took to develop a relation considering providing services and selling goods to zaibatsu, which were put to a thoroughtful consideration during Russo-Japanese war. In this article author provides an analysis of role of each classic zaibatsu had been running during preparation to the war between Russian Empire and Japan (so called “big four” zaibatsu) and what part they took in creating Japanese Imperial military forces, putting special consideration to its role in such vital sphere as shipbuilding and producing raw materials. Author seeks law government provided as one of the primary sources of effective organizing this partnership in case of reaching expansion purposes.