His main work is "Nogaku Genryu Ko"(The origin of Noh play) published in 1938, which consists of two parts: "Sarugaku in the Heian period" and "Sarugaku in the Kamakura Yoshino period" along with an appendix "Dengakuko", and describes the history of Noh from creation of Noh to the end of the Sengoku period (the period of warring states).
主著は1938年（昭和13年）に上梓された『能楽源流考』で「平安時代の猿楽」「鎌倉吉野時代の猿楽」の2篇と附篇の「田楽攷」からなり、能の発生から戦国末期までの能楽史を網羅する。