“The Iwakura embassy, 1871-73” can be read as a sort of the Japanese grammar book aiming at mastering the foreign language of the name of “modern Western civilization,” almost all aspects of which, like technologies, economical principles, social institutions, positive laws, artistic modes, geographical knowledges, and each national histories, are extensively and intensively recorded in these volumes. What this magnum opus also documents, is, more significantly, the discontinuous processes, in which modern Japan designed her peculiar “imaginative geography” of the modern world, and in which her own subjectivity and status were granted. This paper is based on the hypothesis that the crucial significance of “The Iwakura embassy, 1871-73” for the political development of future Japan was the rediscovery of Prussia, not of England, much less of France. The three main points help to elucidate the position. First, the description of Prussia in the third volume is distinguished by its well-poised, quite affective approach, rather than by an over-and-underestimation. Such an attitude gives an indication of an unbashful gaze into other`s eyes, a more positive response to the other`s hospitality. Second, in regard to the discursive formation Prussia takes an intermediate position in the global imaginative geography, a focal point in which modern Japan managed to fix her own vista and to objectify modern Western civilization. Third, the Prussian imagery of Japan is here only revealed through the Japanese gaze and so the both sides are supposed to have a contrapuntal relationship. In this respect, “Prussia” can be defined as a discursive formation which gave birth to the modern Japanese subjectivity and simultaneously brought about her structural deficiency leading to Japan`s self-imposition on the East Asia, after all. These three points in all confirm that the Japanese “German turn” was prefigured by the political aspirations of the Iwakura mission.