Government of Japan in the context of "Unitary state"

Tokyo, officially the Tokyo Metropolis, is the capital and most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is one of the most populous urban areas in the world. The Greater Tokyo Area, which includes Tokyo and parts of six neighboring prefectures, is the most populous metropolitan area in the world, with 41 million residents as of 2024.

Lying at the head of Tokyo Bay, Tokyo is part of the Kantō region, on the central coast of Honshu, Japan's largest island. It is Japan's economic center and the seat of the Japanese government and the Emperor of Japan. The Tokyo Metropolitan Government administers Tokyo's central 23 special wards, which formerly made up Tokyo City; various commuter towns and suburbs in its western area; and two outlying island chains, the Tokyo Islands. Although most of the world recognizes Tokyo as a city, since 1943 its governing structure has been more akin to that of a prefecture, with an accompanying Governor and Assembly taking precedence over the smaller municipal governments that make up the metropolis. Special wards in Tokyo include Chiyoda, the site of the National Diet Building and the Tokyo Imperial Palace; Shinjuku, the city's administrative center; and Shibuya, a hub of commerce and business.

The Cabinet of Japan (内閣, Naikaku; Japanese pronunciation: [naꜜi.ka.kɯ]) is the chief executive body of the government of Japan. It consists of the prime minister, who is appointed by the Emperor after being nominated by the National Diet, in addition to up to nineteen other members, called ministers of state. The current cabinet, the Takaichi Cabinet, was formed on 21 October 2025 and is led by Prime Minister Sanae Takaichi. The country has had a Liberal Democratic minority government since 2025.

The prime minister is nominated by the National Diet, while the remaining ministers are appointed and dismissed by the prime minister. The Cabinet is collectively responsible to the National Diet and must resign if a motion of no confidence is adopted by the National Diet.

Municipalities are a level of administration in Japan. The country has three levels of governments: national, prefectural, and municipal.

The nation is divided into 47 prefectures (within these, one metropolis, one regional prefecture, and two urban prefectures). Each prefecture consists of numerous municipalities, with 1,719 in total as of January 2014.

The Local Autonomy Act (地方自治法, Chihō-jichi-hō), passed by the House of Representatives and the House of Peers on March 28, 1947 and promulgated as Law No. 67 of 1947 on April 17, is an Act of devolution that established most of Japan's contemporary local government structures and administrative divisions, including prefectures, municipalities and other entities. On July 16, 1999, the law was amended to eliminate administrative functions imposed upon local governments by the central governments and to establish Committee for Settling National-Local Disputes. The law and other relevant laws have been amended after the revision to promote decentralization.　

The Imperial Court in Kyoto was the nominal ruling government of Japan from 794 AD until the Meiji period (1868–1912), after which the court was moved from Kyoto (formerly Heian-kyō) to Tokyo (formerly Edo) and integrated into the Meiji government. Upon the court being moved to Kyoto from Nagaoka by Emperor Kanmu (737–806), the struggles for power regarding the throne that had characterized the Nara period diminished. Kyoto was selected as the location for the court because of its "proper" amount of rivers and mountains which were believed to be the most auspicious surroundings for the new capital. The capital itself was built in imitation of Chang'an, the Chinese capital of the Tang dynasty, closely following the theories of yin-yang. The most prominent group of people within the court was the civil aristocracy (kuge) which was the ruling class of society that exercised power on behalf of the emperor.

Kyoto's identity as a political, economic, and cultural centre started to be challenged in the post-1185 era with the rise of the shogunate system which gradually seized governance from the emperor. Minamoto no Yoritomo was the first to establish the post of the shōgun as hereditary, receiving the title in 1192. After Yoritomo launched the shogunate, true political power was in the hand of the shōguns, who were mistaken several times for the emperors of Japan by representatives of Western countries. The Kamakura shogunate (or Kamakura bakufu) would go on to last for almost 150 years, from 1185 to 1333.

The Ministry of Internal Affairs and Communications (総務省, Sōmu-shō; lit. 'Ministry of General Affairs'; MIC) is a cabinet-level ministry in the Government of Japan. Its English name was Ministry of Public Management, Home Affairs, Posts and Telecommunications (MPHPT) prior to 2004. It is housed in the 2nd Building of the Central Common Government Office at 2-1-2 Kasumigaseki in Chiyoda, Tokyo, Japan.

The Ministry oversees the Japanese administrative system, manages local governments, elections, telecommunication, post, and governmental statistics.