The purpose of this research was to investigate the transition of "Japanese Music" in the "Course of Study for Music". This paper analyzed how the Course of Study had been revised between the tentative plan in 1947 and the revised one for high school in 1960. This research presented two findings. First, "Japanese Music" had been incorporated since the tentative plan in 1947. Second, every time the Course of Study was revised, the importance of learning "Japanese music" was emphasized, which led to the development of the common teaching materials and the publication of relevant guide books. However, if the teachers themselves do not appreciate "Japanese Music" , the teaching of "Japanese Music will be neither developed nor matured. It is important to reconfirm the idea and the meaning of the teaching of the other areas of music education as well as the teaching of "Japanese Music".