Japan performance art Nogaku Theater that has got a six hundred year background was declared the Masterpiece of Human Being which was Oral and Intangible Heritage by UNESCO in 2001. UNESCO intended to attract attention to the field of Intangible Cultural Heritage with the 90 masterpieces that it declared all over the world in 2001, 2003, and 2005. Japan accepted that Intangible Heritage should also be kept beside the Tangible Cultural Property under the Law of Protection of Cultural Heritage that they enacted in 1950. In the process from 1950 until 2001 when the declaration was performed, Japan has been in the position of a country that can put the programs of protecting and developing intangible heritage in to the application area exceedingly. However, the objectives of UNESCO have constituted a whole under the current Law in japan after 2001. In this sense, by which processes and laws Nogaku theater was tried to be protected in Japan before it was declared as a masterpiece, why Nogaku theater was declared as a masterpiece, which participations occurred actively in this process at national and international level in 2001 and later; and the points reached at today at the end of all these processes are the main subjects of this article.