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Ohito onsen in Izunokuni
Ohito onsen in Izunokuni
Flag of Izunokuni
Official seal of Izunokuni
Location of Izunokuni in Shizuoka Prefecture
Location of Izunokuni in Shizuoka Prefecture
Izunokuni is located in Japan
Coordinates: 35°2′N 138°56′E / 35.033°N 138.933°E / 35.033; 138.933Coordinates: 35°2′N 138°56′E / 35.033°N 138.933°E / 35.033; 138.933
Country Japan
Region Chūbu (Tōkai)
Prefecture Shizuoka Prefecture
 • Mayor Toshiko Ono
 • Total 94.62 km2 (36.53 sq mi)
Population (December 2016)
 • Total 47,862
 • Density 515/km2 (1,330/sq mi)
Time zone Japan Standard Time (UTC+9)
- Tree Nageia nagi
- Flower viola
Phone number 055-948-1413
Address 340-1 Nakaoka Izunokuni-shi, Shizuoka-ken
Website www.city.izunokuni.shizuoka.jp
Izunokuni City Hall

Izunokuni (伊豆の国市 Izunokuni-shi?) is a city located in Shizuoka Prefecture, Japan.

The city, which covers an area of 94.62 square kilometres (36.53 sq mi), had an estimated population in December 2016 of 47,862, giving a population density of 506 persons per km2.


During the late Heian and Kamakura periods, the town of Nirayama within the current borders of Izunokuni was the home of the Hōjō clan, which dominated Japanese politics in the 12th century. A castle was established at Nirayama by Ise Moritoki, founder of the Late Hōjō clan in 1493.During the Edo period, most of Izu Province was tenryō territory under direct control of the Tokugawa shogunate, who ruled Izu and parts of eastern Suruga Province from a daikansho established at Nirayama. After the Meiji Restoration, the area became the short-lived Nirayama Prefecture, which was merged into the equally short-lived Ashigara Prefecture in 1871. From 1876, the area has been part of Shizuoka Prefecture. During the cadastral reform of 1886, the area was reorganized into several villages under Kimisawa District, which was with Tagata District in 1896.

In 1934, Izunagaoka was elevated to town status, followed by Ōhito in 1940, and Nirayama in 1962.

The modern city of Izunokuni was created on April 1, 2005 from the merger of the towns of Izunagaoka, Nirayama and Ohito (all from Tagata District).


Izunokuni is located on the northern "neck" of the Izu Peninsula in eastern Shizuoka Prefecture. The region is hilly, with numerous hot springs. The climate of the region is temperate maritime, with hot, humid summers and short, cool winters, with the warm Kuroshio Current offshore having a moderating effect.

Surrounding municipalities[edit]


The economy of Izunokuni is dominated by agriculture (strawberries and tomatoes) and by tourism related to the hot spring resort industry.




Local attractions[edit]

Nirayama reverberatory furnace site[edit]

Areverberatory furnace for the purpose of manufacturing cannon was built in what is now part of Izunokuni by the Bakumatsu period Tokugawa shogunate in 1857. It was officially registered as a UNESCO World Heritage Site, as one of the constituent Sites of Japan’s Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining in 2015

Nirayama reverberatory furnace site


Sister City relations[edit]

Notable people from Izunokuni[edit]

A view from top of Mount Jōyama in Izunokuni


  1. ^ [1] UNESCO World Heritage Convention home page

External links[edit]

Media related to Izunokuni, Shizuoka at Wikimedia Commons