With an objective to redraw the modern/contemporary history of Japan from the viewpoint of “economics”, Contemporary Economic History of Japan Ⅰdiscusses the chronicle that spans from the period prior to Japanese-Russo War, through World War Ⅰ, and to the pre-World War Ⅱ. Economic activities and their statuses constitute significant parameters to put social conditions in motion on a grand scale, and even change social systems and politics. Let us review relationships between the transactions and sociopolitical dynamism in the Japanese modern/contemporary time-line.