Subjectivity and rationality---主体性と合理性 Today I wrote a paper about the traditions of Subjectivity and Rationality in Western philosophical history, so i wil introduce its outline. In Western philosophy many philosophers tried to bind subjectivity and rationality when they mentioned the truth. ''Where'' can we find the trurh? In Subjectivity, or Rationality? if we lean to Subjectivity It becomes difficult to share the truth, and if we chose Rationality simply the truth leave us and it becomes an armchair theory. In the end of 18th century Kant tried to bind them, and I called it '' Marriage of Subjectivity and Rationality''. Although the accuracy of his thought, the marriage was in difficult situation and never be completed. The repulsion against Kant is mainly devided to two direction. First one is analytic philosophy lead by Bertrand Russel. They abandoned subjectivity and mentioned the individuality of rationality and logic. However, clealy, it remains the probrem of the direct relationship between human and truth. Second descent is Exitentialism lead by Kierkegaard who said ''truth is subjectivity''. the insistence is very powerful but dangerous, because it dosen't care for rationality However, without rationality, the truth becomes only an issue of each person and philosophy or dialogue becomes nonsense. Then, I think we must considerate sincerely both, because key to the truth need the marriage of subjectivity and rationality inspite of the lack of our ability to know whether the marriage can be made or not.