Along with the democracy, the Emperor Organ Theory supported practices in the parliamentary Cabinet system, and party government and Taisho Democracy, and also because Minobe's book became a bible of examinees for high civil officers, the theory became a constitutional doctrine approved by the state from the middle of Taisho period through early Showa period.
民本主義と共に、議院内閣制の慣行・政党政治と大正デモクラシーを支え、また、美濃部の著書が高等文官試験受験者の必読書ともなり、大正時代半ばから昭和の初期にかけては、天皇機関説が国家公認の憲法学説となった。