It has been said that this was due to adapting the power of the Prime Minister to Article fifty five of the Constitution of the Empire of Japan, "Each Minister of State shall make advices to the Emperor with full responsibility of the results and fulfill its duties."
これは帝国憲法第五十五条の〝國務各大臣ハ天皇ヲ輔弼シ其ノ責ニ任ス〟に合わせるためだといわれる。