Akasaka Palace, or the State Guest House, is one of the two state guest houses of the Government of Japan. The other state guesthouse is the Kyoto State Guest House. The palace was originally built as the Imperial Palace for the Crown Prince in 1909.
The Akasaka Palace has been open to the public since 1975 for 10 days a year during a summer period, with a view to enhancing the understanding of the public on the significance of the Palace, as the national facility, playing an important role in the Japanese diplomacy.
As the Palace was registered as a national treasure in 2009, efforts have been made to increase the opportunity to the public to show this invaluable national treasure.