He was born in Takasago in Hyogo, second son of the herbal doctor Minobe Shuho. He studied at local schools in Takasago and Ono and excelled at his studies, later moving on to the First Higher Middle School in Tokyo and the path of law and politics.
He entered the politics department of the Imperial University's law college and studied under the constitutional scholar Ichiki Kitokuro, an early proponent of the emperor-organ idea. Ichiki's thinking became the foundation of Minobe's scholarship. After graduating in 1897 he passed the higher civil service exam and joined the Home Ministry.
He was sent to study in Germany, France and Britain to research comparative legal history. While abroad he became an assistant professor at Tokyo Imperial University, and on returning in 1902 he was made professor. From German public law he learned ideas that led to his later theory.
Through his teacher Ichiki and his wife, he married Tamiko, third daughter of Education Minister Kikuchi Dairoku. This year he became a doctor of law and also taught constitutional and administrative law at Tokyo Higher Commercial School, now Hitotsubashi University, later becoming a leading authority in both fields.
In his book Kenpo Kowa he set out the emperor-organ theory, which sees the state as a legal person and the emperor as its highest organ governing under the constitution. He debated fiercely with Uesugi Shinkichi, who held that the emperor had absolute sovereignty, and his view became the mainstream in academia.
He took on a constitutional law chair as well, lecturing without consulting any books or notes. His student Kiyomiya Shiro said it seemed beyond human ability. He trained many disciples such as Miyazawa Toshiyoshi, and his theory gave theoretical support to party politics centered on the Diet.
When parts of the military attacked the government over the London Naval Treaty as violating the supreme command, he argued that deciding force levels was the cabinet's responsibility and supported the Hamaguchi Osachi cabinet, trying to defend constitutional politics as military power grew.
He became an imperially appointed member of the House of Peers. When Inoue Junnosuke lost his life in the League of Blood Incident that year, he criticized the government for its lax control of right-wing groups. In 1934 he retired from Tokyo Imperial University and became professor emeritus.
In the House of Peers Kikuchi Takeo fiercely denounced the emperor-organ theory, and attacks by the military and the right spread. Minobe explained the soundness of his theory logically in a speech of personal defense, but his books were banned and he had to resign from the House of Peers.
A right-wing man who visited his home attacked and injured him, having come under a false identity. It was an age when freedom of speech was shrinking so far that a scholar could be targeted for his theory. Minobe afterward quietly continued his research.
After the war, as an adviser to the cabinet's constitutional problems committee and a privy councilor, he took part in debates on constitutional revision. Believing democratization was possible under the old constitution, he was the only one to vote against the new draft in the Privy Council, and was called an example of the limits of old liberals.
Once the Constitution of Japan was made, he studied it eagerly, writing many books and papers, and the year before had become the first head of Hosei University's correspondence division. He died in May, about a year after the new constitution took effect, and disciples such as Miyazawa Toshiyoshi carried on postwar constitutional studies.
Honda KōtarōShimamura HōgetsuSakai ToshihikoIzumi KyōkaSuzuki UmetarōYanagita KunioUemura ShōenYoshino Sakuzō
People of the Taishō period ・ People by period
Based on facts found in textbooks and biographies. Uncertain points are marked as such.