It is widely accepted that the basic principle to be aware of when considering the issue of state and religion is "separation of state and religion." However, "separation of state and religion" in the Japanese sense belongs to a unique, particular type, definitely different to that of the Western sense. Furthermore, the principle itself is being called into question in the West. Against this background, this paper focuses on the "separation of church and state" in the U.S. in an attempt to identify any ideological problems behind it. Chapter 1 discusses how the principle of "separation of state and religion" is understood in Japan by referring to relevant legal precedents and academic theories, and classifies Western variations, in order to identify the characteristics of the Japanese understanding of this principle. Chapter 2 examines the U.S. Constitution, which is said to be the first constitution in the world to incorporate the principle of "separation of church and state," placing special focus on separatism, which has had a huge influence on Japan's legal precedents and academic theories. Chapter 3 discusses changes that have occurred since the 1980s, clarifies the principles and doctrines concerning state and religion that have been identified so far, as well as the ideologies behind them, and highlights problematic issues.
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