Imperial House Act is a law of Japan, institution of which was indirectly obligated by the Constitution of Japan and which establishes the system, composition, and the like of the Imperial family, such as an order of succession of the Imperial Throne.
皇室典範（こうしつてんぱん）は、皇位の継承順位など皇室の制度・構成等について定める日本国憲法で間接的に設置が義務づけられた日本の法律である。