General · EdgepediaSeptember 17, 20267 min read

Japan (日本)

Japan (日本, Nihon or Nippon) is an island country in East Asia, located west of the Pacific Ocean in the Northern Hemisphere, with neighbors including the Republic of Korea, China, and Russia.¹ It is governed as a parliamentary constitutional monarchy with an emperor as head of state, a bicameral Diet, and 47 prefectures, with Tokyo as the capital.¹ Its economy, at US$4.44 trillion in nominal GDP as of 2025, is the world's third largest.¹

Key fact	Detail
Land area	377,974.87 km² (145,936.91 sq mi) as of April 1, 2026; 47 prefectures¹
Population	123.05 million as of October 1, 2025, down 3.097 million (−2.5%) from the 2020 census²
Economy	GDP US$4.44 trillion; GDP per capita US$35,951 (2025, World Bank); third-largest economy by nominal GDP¹
Seismic setting	About 20% of the world's earthquakes of magnitude 6 or higher occur in and around Japan; 110 active volcanoes, nearly 7% of the global total³
Legislature	House of Representatives (Shugi-in) 465 members; House of Councillors (Sangi-in) 248 members¹
Head of government	Prime Minister Sanae Takaichi, in office since October 2025, Japan's first female leader⁴
Public debt	National debt about triple the size of the economy⁵

Geography and natural hazards

The Japanese archipelago consists of five relatively large islands, Hokkaido, Honshu, Shikoku, Kyushu, and Okinawa, with nearly 7,000 smaller islands around them.³ Geologically, the country sits at the eastern end of the Eurasian Plate and the end of the North American Plate, where the subduction of two oceanic plates, the Pacific Plate and the Philippine Sea Plate, beneath the continental plates drives active crustal movement.³

This position makes Japan one of the most disaster-prone countries in the world. Approximately 20% of the world's earthquakes of magnitude 6 or higher occur in and around Japan, and with 110 active volcanoes the country is among the most volcanically active.³ The Ministry of Foreign Affairs adds that extreme climatic variation, including seasonal rain fronts, typhoons, and heavy snowfall on the Sea of Japan side, together with rugged topography and a complex tsunami-vulnerable coastline, contributes to the high incidence of natural disasters.⁶ Between the end of World War II and the late 1950s, major typhoons, earthquakes, and other calamities killed over 1,000 people virtually every year, prompting systematic disaster-prevention measures from the 1960s onward.⁶

Population

The 2025 Population Census, the 22nd in a series conducted every five years since 1920, counted 123.05 million people as of October 1, 2025, a decrease of 3.097 million (−2.5%) from 2020, with the rate of decline accelerating.² Population fell in 1,558 of Japan's 1,719 municipalities, or 90.6%.²

Concentration in Tokyo. Tokyo-to was the largest prefecture at 14.246 million people, and the Tokyo metropolitan area, comprising Tokyo-to, Kanagawa-ken, Saitama-ken, and Chiba-ken, held 36.986 million people, about 30% (30.1%) of the national population.² Households numbered 57.125 million, up 2.3% from 2020, while average household size fell to 2.15 members.²

The demographic shrinkage is driven by an aging structure. Japan's working-age population, aged 15 to 64, peaked in 1995 and has been shrinking by approximately 0.6% per year since.⁷ The Ministry of Finance has described the population decline as a "quiet emergency."¹⁸

Government

Japan's national legislature, the Diet, consists of a House of Representatives (Shugi-in) with 465 members and a House of Councillors (Sangi-in) with 248 members.¹ Administration runs through the Prime Minister's Office, the Cabinet Secretariat, and 14 ministries and agencies, and the judiciary comprises the Supreme Court, High Courts, District Courts, Summary Courts, and Family Courts.¹

The modern constitutional state took shape in the Meiji era. After the restoration of political authority to the Emperor in 1867 and the Charter Oath of 1868, which promised deliberative assemblies and decisions by public opinion, work on a national constitution proceeded through the 1870s and 1880s, and the Constitution of the Empire of Japan (the Meiji Constitution) was promulgated on February 11, 1889.⁹ The present constitution dates from 1947; scholarly assessment has described it as firmly woven into the institutional framework of Japanese society, with the renunciation of war among its basic principles.¹⁰

Current politics. After the ruling coalition lost its majority in both houses of parliament, Liberal Democratic Party president Sanae Takaichi succeeded Shigeru Ishiba as prime minister in October 2025 and soon dissolved the lower house; she took office as Japan's first female leader.⁷^•⁴ Her government prioritizes addressing the cost of living and strengthening the resilience and dynamism of the economy.⁷ In November 2025 the Cabinet approved a 21.3 trillion yen (US$135.4 billion) stimulus package, including one-time cash handouts of 20,000 yen per child and rice vouchers worth 3,000 yen per person.⁵

Economy

Japan's nominal GDP was US$4.44 trillion in 2025, with GDP per capita of US$35,951, making it the world's third-largest economy.¹ Main industries include automobiles, consumer electronics, computers, and other electronics.¹

The economy has shown resilience in recent years. The IMF reported in 2026 that output was growing above potential, with a sustained expansion supported by domestic demand, and projected a strong current account surplus driven by income from Japan's large stock of net foreign assets.¹¹ The OECD similarly noted that after three decades of near-zero inflation there are signs of a transition to a new equilibrium of price, growth, and income dynamics.¹² The Ministry of Finance pointed to a second consecutive year of wage growth above 5% as evidence of a shift from a deflationary, cost-cutting economy to a growth-oriented one.⁸

Pressures. High inflation has contributed to a 6% fall in real wages since 2022, eroding household purchasing power.⁷ Public debt stands at about triple the size of the economy, and the IMF projects that rising spending on interest and on health and long-term care for the aging population will push the debt-to-GDP ratio upward from 2035.⁵^•¹³ Structural weaknesses include the OECD's lowest stock of inward foreign direct investment, around 5% of GDP, which the government aims to increase.¹² The shrinking, aging population also creates a structural labor shortage, with labor participation already at what the Ministry of Economy, Trade and Industry describes as the world's highest level.¹⁴

Defense and security

Japan is in the midst of a military buildup. The Cabinet approved a record draft defense budget exceeding 9 trillion yen (US$58 billion) for fiscal 2026, up 9.4% from 2025, in the fourth year of a five-year program to double annual arms spending to 2% of GDP.¹⁵ Prime Minister Takaichi pledged to reach the 2% target by March, two years earlier than the initial plan, and to revise the national security strategy, last adopted in December 2022, by the end of 2026.⁴^•¹⁵ The 2026 budget allocates more than 970 billion yen to standoff missile capability, including a 177 billion-yen purchase of upgraded Type-12 surface-to-ship missiles with a range of about 1,000 kilometers, and more than 160 billion yen to jointly develop a next-generation fighter with Britain and Italy for deployment in 2035.¹⁵ At full scale the program would make Japan the world's third-largest defense spender after the United States and China.¹⁵

Society and well-being

Japan performs well across a number of well-being dimensions in the OECD Better Life Index but underperforms the average in income, social connections, civic engagement, and life satisfaction; average household net-adjusted disposable income per capita is USD 28,872 a year, below the OECD average of USD 30,490.¹⁶ The OECD's 2026 survey reports that Japan displays one of the highest proficiency levels in literacy and numeracy in the OECD, while shares of under-skilled and over-qualified employees and of field-of-study mismatch are higher than the OECD average.¹⁷ A country profile prepared for the OECD Nuclear Energy Agency describes Japanese average life expectancy as the highest among OECD countries.¹⁸

References

Topic: Encyclopedia › Places and geography › Countries, territories, and regional overviews › Countries and territories › Titles H to Q

Initially written Sep 17, 2026 · Reviewed: Sep 18, 2026; Sep 30, 2026; Oct 21, 2026 · Edited: Sep 18, 2026; Sep 30, 2026; Oct 21, 2026 · Last review: Oct 21, 2026

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