Tokyo is the capital of Japan, a metropolis at the head of Tokyo Bay in the Kantō region of Honshu, and the seat of both the national government and the Emperor. The Tokyo Metropolis had over 14 million residents in 2023, and the Greater Tokyo Area, reaching into six neighbouring prefectures, had about 33 million in 2025. Yet no Japanese law has ever declared Tokyo the capital. It became one in stages: first as the shogun’s headquarters in 1603, then as the Emperor’s home from 1869, and finally by long-standing custom, a status that was debated as recently as the 1990s.
That is an unusual history for a capital, and it explains a lot about how the city works today. Here is how Edo became Tokyo, why the move was never quite formalised, and what being the capital means for the city now.
Edo Castle and the Shogun’s Seat, 1457–1867
For most of Japanese history the capital was wherever the Emperor lived, and that was far to the west. Heijō-kyō, at Nara, served from 710, and Heian-kyō, modern Kyoto, from 794 until 1868. The marshy shore of Musashi Province, where Tokyo stands, was provincial territory. A warrior named Edo Shigetsugu built a residence here around the end of the twelfth century, and in 1457 Ōta Dōkan, a retainer of the Uesugi family, raised Edo Castle on the site to defend the region against the Chiba clan. The Later Hōjō clan took it in 1524.
Why Tokugawa Ieyasu chose Edo
The decisive move was not really a choice. After Toyotomi Hideyoshi defeated the Hōjō at the Siege of Odawara in 1590, he granted Tokugawa Ieyasu the eight provinces of the Kantō, moving him away from his home province of Mikawa. Ieyasu made Edo Castle, vacated during the Odawara campaign, his base. When the Emperor appointed him shōgun in 1603, the country came to be governed from Edo, even though the Emperor in Kyoto remained the formal sovereign and granted the shogun’s title. For the next 264 years Japan had, in effect, two capitals: a ceremonial one in Kyoto and a working one in Edo.
The shogunate made sure everyone who mattered spent time in Edo. Under the system of sankin-kōtai, or alternate attendance, made compulsory for the outside lords in 1635 and for the hereditary vassals in 1642, most daimyo had to live in Edo every other year, and their wives and heirs stayed there permanently as hostages. Keeping mansions in the city and marching retinues back and forth drained their treasuries and filled Edo with people, craftsmen and inns. By the eighteenth century Edo had about a million inhabitants, one of the largest cities in the world. It was also fragile: the Great Fire of Meireki on 2 March 1657 destroyed 60 to 70 per cent of the city and is estimated to have killed more than 100,000 people. The castle’s great keep burned and was never rebuilt.
The Move of 1868–1869: An Eastern Capital Without a Decree
The arrival of Commodore Matthew Perry’s squadron in 1853 broke the shogunate’s grip. Trade, inflation and unrest followed, and supporters of the Emperor used them to push the Tokugawa aside. The last shōgun, Tokugawa Yoshinobu, resigned in November 1867, and on 3 January 1868 the restoration of imperial rule was proclaimed in Kyoto. Edo Castle was handed over to the imperial side, and the last shogunate loyalists in the city were defeated at the Battle of Ueno on 4 July 1868.
Why the Emperor went east
On 3 September 1868 the city was renamed Tokyo, literally “Eastern Capital”, and the young Emperor Meiji moved into the former castle, which became the Imperial Palace, in 1869. The move gave the new government the shoguns’ own castle as its palace: the compound was renamed Tokyo Castle in October 1868 and the Imperial Castle in 1869. Ministries such as Finance followed by 1871, and the new state built its institutions in Tokyo: Ueno Park in 1873, the University of Tokyo in 1877, the Tokyo Stock Exchange in 1878 and the country’s first railway, from Shimbashi to Yokohama. The City of Tokyo was formally created on 1 May 1889, and the Imperial Diet has met in Tokyo since it was established that year.
Why nobody signed the paperwork
What never happened was a formal transfer. Traditionally the capital was simply the Emperor’s residence, and the modern word for a national capital, shuto, only came into use in the 1860s as a translation of the English “capital”. When the Ministry of Education published a history of the Restoration in 1941, it carefully described Tokyo as “designated” a capital, tento, rather than using sento, the word for relocating one, so the official record never actually says the capital moved. Later laws, starting with the Metropolitan Area Readjustment Act of 1956, define a “capital area” around Tokyo without naming a capital. Asked in the Diet in February 2018, Prime Minister Shinzo Abe confirmed that no law defines the capital, adding that Tokyo’s status is widely accepted. Kyoto kept its old imperial palace, but not the government.
Rebuilt Twice: The Great Kantō Earthquake and the 1945 Firebombing
Two catastrophes could have prompted a move, and neither did. On 1 September 1923 the Great Kantō earthquake and the fires that followed killed an estimated 105,000 people, and the losses amounted to 37 per cent of the country’s economic output. The city was rebuilt with more concrete and earthquake-resistant construction, and the Ginza Line between Ueno and Asakusa opened on 30 December 1927 as the first underground railway outside Europe and the Americas. The National Diet Building, begun in 1920 after decades of argument over its design, was completed in 1936 at Nagatachō, giving parliament its first permanent home after nearly fifty years in temporary halls.
In 1943 the wartime government merged Tokyo City with Tokyo Prefecture to create the Tokyo Metropolis, the structure that still governs the capital, with a governor and assembly above the municipalities. Two years later came the bombing. On the night of 9–10 March 1945, the raid code-named Operation Meetinghouse dropped nearly 700,000 incendiary bombs on the low-lying east end, the Shitamachi, destroying more than 276,000 buildings and killing about 100,000 civilians in a single night. The main buildings of the Imperial Palace burned in another raid on 25 May 1945. Across the war years the city’s population fell from 6.7 million to under 2.8 million as men went to the front and children were evacuated.
Tokyo then served as the base from which Allied occupation forces under Douglas MacArthur governed Japan for six years. In 1947 its 35 pre-war wards were reorganised into the 23 special wards that exist today, and the rebuilt capital led the country’s post-war recovery, marked by the first Shinkansen line, to Osaka, and the first Olympic Games held in Asia, both in 1964.
What Being the Capital Means for Tokyo Now
The plan to move the government
By the late twentieth century the concentration of power, money and people in Tokyo had become a policy problem in its own right. Proposals to relocate the capital functions were drawn up from 1979, and in 1995 the Diet voted to move government away from Tokyo. In 1999 a panel shortlisted three regions: Tochigi and Fukushima to the north, Gifu and Aichi to the west, and an area near the ancient capitals of Nara, Kyoto and Shiga. The plan never went ahead, and in 2003 Prime Minister Junichiro Koizumi closed the parliamentary discussion in the face of fierce opposition. It did not include moving the Imperial Palace, and Prime Minister Ryutaro Hashimoto had already ruled that out in 1996, so officials spoke of relocating “capital functions” rather than the capital. The one concrete result came much later: in 2023 the Agency for Cultural Affairs moved to Kyoto, the first central government office to leave Tokyo since the city became the capital.
A capital that fills up every morning
Capital status shows most clearly in the daily tide of commuters. The ministries of Kasumigaseki, whose name has become shorthand for the national bureaucracy, and the Diet at Nagatachō both lie in Chiyoda ward, facing the palace grounds of the old Edo Castle. So do the Marunouchi business district and Tokyo Station, which opened on 20 December 1914 in front of the palace gardens; in the Edo period both sites lay inside the castle’s outermost moat. On weekdays the metropolis gains more than 2.5 million people as workers and students arrive from neighbouring prefectures. In the three central wards of Chiyoda, Chūō and Minato the 2005 census counted 326,000 residents at night but about 2.4 million people during the day.
The metropolitan government itself moved west in December 1990 into Kenzo Tange’s Tokyo Metropolitan Government Building in Shinjuku, whose 243-metre main tower was the tallest building in Tokyo by roof height until 2007. The Tokyo Metropolis also stretches far beyond the city most visitors know: it includes commuter towns and mountains to the west and the Izu and Ogasawara islands, which extend more than 1,000 km into the Pacific.
Four centuries after Ieyasu arrived at a vacated castle, the city he chose is a capital by history and habit rather than by statute, and the arguments about spreading its functions elsewhere have never fully gone away. For how many people that status draws into the city, see our breakdown of the population of Tokyo.
Quick Facts About Tokyo
- Country: Japan
- Continent: Asia (East Asia)
- Country population: approximately 122.4 million
- Capital city status: Tokyo is the capital of Japan, the seat of national government, and the location of foreign embassies, parliament, and the head of state's official residence.
Frequently Asked Questions
What is the capital of Japan?
The capital of Japan is Tokyo. Tokyo is the seat of national government, hosts most foreign embassies and consulates, and is typically where the head of state and parliament are located.
What continent is Tokyo in?
Tokyo, the capital of Japan, is located in Asia, in the East Asia region. As Japan's capital, Tokyo serves as the country's primary connection to the broader Asian political, economic, and cultural sphere.
Why is Tokyo the capital of Japan?
Tokyo was chosen as the capital of Japan for reasons that typically combine geography, history, and politics. Capital city selections often reflect a desire for centrality (being accessible from across the country), historical importance (being a longstanding seat of government or culture), or neutrality (being acceptable to multiple regions or ethnic groups within the country). The specific reasons for Tokyo's designation are detailed in the city's history above.
What is Tokyo known for?
As the capital of Japan, Tokyo is best known for housing the country's central government institutions — parliament, presidential or royal residences, supreme court, and key ministries. It is also typically a major cultural and economic center within Japan, hosting national museums, embassies, and signature monuments. The introduction and history sections above provide detailed coverage of the city's specific notable institutions and landmarks.
Related Pages
- Japan Country Guide — full geography, climate, economy, and culture overview
- Flag of Japan — meaning, history, and design of Japan's national flag