Architecture & Layout
The East Garden of the Imperial Palace contains 600 years of architectural layers β from Edo Castle's original stone walls and guardhouses to the 1968 Kyuden and the 1966 Tokagakudo Concert Hall. This is what each structure is, and why it matters.
The Imperial Palace grounds are not a single building but a complex of distinct zones accumulated over nearly six centuries. What visitors see in the East Garden today are the ruins, walls, and surviving structures of Edo Castle's innermost enclosure β the Honmaru (main compound). The Kyuden (current palace building) and the Emperor's private residence are in separate zones not open to the public.
The East Garden alone contains over a dozen named structures and sites. An Imperial Palace guided tour connects them chronologically β which guardhouse was built first, why the gates were placed where they were, and what the stone base of the Tenshukaku tells you about what once stood there.
The primary public entrance to the East Garden, Εte-mon was the formal front gate of Edo Castle β the gate through which visiting daimyo lords and official delegations entered. The current gate structure dates from reconstructions in the Edo period but preserves the original gatehouse layout, with a masugata (square enclosure) system designed to slow any attacking force. Closest to Tokyo Station and the start of most guided walking tours.
The northern entrance to the East Garden, Hirakawa-mon was historically used for everyday goods and servants β a service gate rather than a ceremonial one. The gate retains its wooden doors and the original masugata courtyard design. Today it functions as one of the three public entry points, offering a quieter entrance than Εte-mon on busy days.
The third public entrance, Kitahanebashi-mon sits on the northern moat edge near Kitanomaru Park. Its name refers to the drawbridge system (hanebashi) that once controlled access across the moat. The gate's position made it a key defensive point β any attacker would face crossfire from both the gate towers and the embankments above the moat.
The most historically significant site in the East Garden β and one of the most evocative ruins in Japan. The Tenshukaku was the five-tiered main keep of Edo Castle, completed in 1638 under Shogun Tokugawa Iemitsu. At its peak, it was the tallest structure in Japan. When it burned in the 1657 Meireki Fire, the shogunate chose not to rebuild it. What remains is the massive stone platform on which it stood β visitors can climb it for a panoramic view across the garden, standing exactly where the keep's ground floor once was. No restoration has been attempted; the ruins communicate more as they are.
One of only three original Edo Castle keeps still standing, Fujimi-yagura ("Mt. Fuji-view Keep") was built in 1659 β two years after the Meireki Fire β and survived both the fire and World War II. Its name comes from the view it historically offered toward Mount Fuji to the southwest. On clear winter days, you can still see the mountain from the garden near this tower. The keep is a three-tiered masugata structure of plastered white walls and curved tile rooflines β a direct visual reference to what the lost Tenshukaku would have looked like.
The third surviving original keep, Fushimi-yagura stands near the Seimon Iron Bridge (Nijubashi) in the outer grounds β visible from the public plaza but not inside the East Garden. Named after Fushimi Castle in Kyoto, it was reportedly relocated from that castle after the Battle of Sekigahara in 1600. It is one of the few structures directly connected to the final unification of Japan under Tokugawa Ieyasu.
Edo Castle's inner compound was protected by a series of guardhouses at its main checkpoint. Three of them survive and are among the most revealing structures in the East Garden β each tells you about a specific tier of the Edo social hierarchy.
The smallest of the three, Doshin-bansho was staffed by low-ranking samurai (doshin) responsible for checking the credentials of anyone entering the castle compound. Built in 1628, it is a single-storey tiled structure of simple construction β its modesty reflects the rank of those who manned it. The name literally means "constable guardhouse."
The largest and most impressive of the three guardhouses β "hyakunin" means "one hundred men," referring to the garrison that once staffed it around the clock in rotating shifts of 20. The four clans who rotated through this duty were all from domains that had supported Tokugawa Ieyasu at Sekigahara in 1600; this was an honour posting as much as a security function. The long, low building with its distinctive curved roof line is one of the best-preserved Edo-period structures on the site.
The senior-ranked guardhouse, Εban-sho was staffed by high-ranking samurai (Εban) from the most prestigious retainer families. Its position at the inner gate of the Honmaru compound made it the last checkpoint before reaching the Shogun's residence itself. The distinction between the three guardhouses β their size, position, and the rank of those who staffed them β is one of the clearest surviving illustrations of the Edo social order.
The three guardhouses are arranged in a deliberately graduated sequence β the further into the compound you moved, the higher the rank of the guards you encountered. A guided tour makes this progression visible as you walk the route; without a guide, most visitors walk past all three without understanding the hierarchy they represent.
The Ninomaru ("second compound") Garden occupies what was once the secondary fortified enclosure of Edo Castle β the zone between the main Honmaru and the outer defences. Today it is a traditional Japanese strolling garden centred on a pond, with stone lanterns, a tea arbour (Suwano-chaya), and seasonal plantings that include irises in early summer and Japanese maples in autumn. The garden was redesigned in 1965 by landscape architect Jihei Ogawa's school following traditional Edo-period conventions.
Built in 1966 to celebrate the 60th birthday of Empress Kojun (grandmother of the current Emperor), the Tokagakudo is one of the most architecturally distinctive modern structures in the East Garden. Its roof design references the petal form of the tΕka (wisteria flower) and its outer walls are covered with mosaics made from fragments of pottery and ceramic pieces β the work of artist Kokei Kobayashi. The hall is used for imperial concerts and is not regularly accessible to the public, but its exterior is visible from within the garden.
Outside the East Garden, in the outer palace grounds, the Seimon Iron Bridge β universally known as Nijubashi ("double bridge") β is the most photographed structure of the Imperial Palace. The name refers to the wooden support bridge that once stood beneath it; the current iron bridge dates from 1888. Behind it, the Fushimi-yagura Keep frames what has become Japan's most recognisable royal image. The bridge is visible from the public plaza and the approach from Nijubashi-mae Station β no garden entry required.
A guided Imperial Palace tour connects every structure in context β from $16, free cancellation.
Book an Imperial Palace Tour β