The name of 'chugu' was not included in the Former Imperial House Law established in 1889, here, chugu was abolished and Haruko became the last chugu.
1889年（明治22年）制定の旧皇室典範には「中宮」の呼称は採りいれられなかったため、ここに中宮は廃絶し、美子が最後の中宮となった。