Career
After studies in Tokyo, France and Germany, he taught law at Tokyo from 1916 to 1926, after which he worked as a lawyer and left his professorship to his student Sakae Wagatsuma. He wrote influential treatises and textbooks on legal transactions (1910) and the law of obligations (1916), but his ideas fell out of fashion after Izotaro Suehiro"s attacks on German-style jurisprudence of concepts. Hatoyama was part of the prominent Hatoyama family.
Through him, Hideo Hatoyama was able to exert great influence on Japanese jurisprudence.