Kosai, Shizuoka

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Kosai City Office
Kosai City Office
Flag of Kosai
Official seal of Kosai
Location of Kosai in Shizuoka Prefecture
Location of Kosai in Shizuoka Prefecture
Kosai is located in Japan
Coordinates: 34°43′28″N 137°31′11″E / 34.72444°N 137.51972°E / 34.72444; 137.51972Coordinates: 34°43′28″N 137°31′11″E / 34.72444°N 137.51972°E / 34.72444; 137.51972
Country Japan
Region Chūbu (Tōkai)
Prefecture Shizuoka Prefecture
 • - Mayor Hajime Mikami
 • Total 86.65 km2 (33.46 sq mi)
Population (June 2012)
 • Total 59,602
 • Density 688/km2 (1,780/sq mi)
Time zone Japan Standard Time (UTC+9)
- Tree Japanese black pine
- Flower Common Gardenia
Phone number 053-576-1111
Address 3268 Kibi, Kosai-shi, Shizuoka-ken 431-0492
Website www.city.kosai.shizuoka.jp/index.html

Kosai (湖西市 Kosai-shi?) is a city located in far western Shizuoka Prefecture, Japan.

As of June 2012, the city has an estimated population of 59,602 and a population density of 688 persons per km². The total area is 85.65 km².


Kosai is located in the far southwest corner of Shizuoka Prefecture, bordered by Aichi Prefecture to the west, Lake Hamana to the east. The name of the city means "west of the lake", in reference to its location near Lake Hamana. The city is bordered to the south by the Enshū Gulf of Pacific Ocean. Due to its location, the warm Kuroshio Current offshore provides for a temperate maritime climate with hot, humid summers and mild, cool winters.

Neighboring municipalities[edit]

Shizuoka Prefecture

Aichi Prefecture


During the Edo period, Kosai was tenryō territory administered directly by the Tokugawa shogunate, and the location of a barrier gate regulating traffic on the old Tōkaidō highway connecting Edo with Kyoto. A post station named Shirasuka-juku developed near the barrier, and this was the forerunner of modern Kosai. During the cadastral reform of the early Meiji period in 1889, the area was reorganized into five villages within Hamana District, Shizuoka. Four of these villages (Washizu, Iride, Shirasuka, Chibata) merged to form the city of Kosai on January 1, 1972.

On March 23, 2010, the town of Arai (from Hamana District) was merged into Kosai. Hamana District was dissolved as a result of this merger.[1]


The economy of Kosai is dominated by light manufacturing of automobile components and electronics, as well as commercial fishing. Kosai is home to Suzuki Motor Corporation's Kosai Assembly Plant, Suzuki's main domestic production plant as well as to plants owned by Panasonic and Sony.




Noted people from Kosai[edit]


External links[edit]

Media related to Kosai, Shizuoka at Wikimedia Commons