日本国憲法第77条
The Supreme Court is vested with the rule-making power under which it determines the rules of practice and of procedure, the admission of attorneys, the internal discipline of the courts, the administration of judicial affairs, and such other matters as may properly affect the free exercise of the judicial power.
Public procurators shall be officers of the court and subject to its rule-making power.
The Supreme Court may delegate the power to make rules for inferior courts to such courts.