When, in accordance with the Imperial House Law, a Regency is established, the Regent shall perform his acts in matters of state in the Emperor's name. In this case, paragraph one of the preceding article will be applicable.
皇室典範の定めるところにより摂政を置くときは、摂政は、天皇の名でその国事に関する行為を行ふ。この場合には、前条第一項の規定を準用する。
Emperor
天皇
The symbol of the State and of the unity of the people, holding that position by the will of the people (Article 1). The Emperor performs only the acts in matters of state the Constitution lists — appointing the Prime Minister the Diet has designated, promulgating laws, convoking the Diet — and has no powers related to government at all (Article 4, paragraph (1), and Articles 6 and 7). Every one of those acts needs the Cabinet's advice and approval, and the Cabinet, not the Emperor, answers for it (Article 3).
Written by AI using Constitution, Arts. 1, 3, 4, 6, 7 and Wikipedia: Emperor of Japan as a reference.