The history of Noh can, with certainty, be traced back to the year 1349 (Jyōwa 5), on the basis of the discovery of four Noh titles along with the cast of each Noh in a compilation called Kasuga Rinji-Sai Ki. It is generally believed that Kannami (1333–1384), who was in his seventeenth year in 1349 (according to traditional Japanese reckoning), laid the foundation of the Noh performance, especially of the performances by Zeami (Kannami’s son, 1363–1443). Noh was a sophisticated form of art and reached great heights with regard to both performance and drama writing. From the time that Noh came into being until the early sixteenth century, many outstanding Noh dramas were written, on the basis of various dramaturgies, by not only Zeami but also Motomasa (Zeami’s son, c.1400–1432), Zenchiku (Zeami’s son-in-law, 1405–c.1470), Nobumitsu (Zeami’s brother’s grandson, 1450–1516), and so on. These dramas were actually performed on stage—sometimes by the drama writer himself—through the Muromachi era. In other words, the period between the mid-fourteenth and early sixteenth centuries was the golden age of the history of Noh drama, in which Noh itself was able to develop further as a performing art. The purpose of this thesis is to select ten significant Noh dramas that were written or performed during this golden age, and to interpret them in detail from the point of view of the dramaturgy of each generation. The titles of the ten selected Noh dramas are as follows: Norikiyo-ga-tobadono-nite-jissyu-no-uta-yomite-aru-tokoro (it is one of the four Noh titles in Kasuga Rinji-Sai Ki in 1349.) Kusakari-no-Noh (it is also called Yokoyama, which was performed by Kannami.) Moriya (performed by Seiami, and his performance was criticized by Zeami) Yamanba (written and performed by Zeami) Kinuta (written and highly evaluated by Zeami himself) Utaura (written and performed by Motomasa) Nonomiya (considered as Zenchiku’s drama) Basyō (written by Zenchiku) Hikami (written by Nobumitsu) Sagoromo (written by Nobumitsu’s friend Sanjyō-nishi-Sanetaka)