A researcher of Japanese language. He graduated from the Department of Linguistics at the Imperial University of Tokyo in 1906. He served as a subordinate member of the National Language Policy Advisory Panel. In 1929 he became a professor at his alma mater and established the Society for Japanese Linguistics in 1944, which he was named the first president of. He studied the history of Japanese-language syllables, from the Jodai era to modern Japan. He discovered Jodai Tokushu Kanazukai and in the field of grammar theory, he discussed bunsetsu-ron. His theory of grammar, also called Hashimoto Bunpo (Hashimoto Grammar), was included in government-authorized school textbooks. His works include Kokugo Onin no Kenkyu (Study of Japanese-language Syllables) and Shin Bunten Bekki (New Supplementary Book for Grammar Study).