Under Article 7 of the Imperial House Economy Act, historic property handed down with the Imperial Throne, such as three sacred imperial treasures, must be handed down to the Crown Prince along with the Imperial Throne.
三種の神器など皇位とともに伝わるべき由緒ある物は、皇位とともに皇嗣が受けることが皇室経済法第7条に定められている。