Townapedia
Kosai City Office
Kosai City Office · KK77, CC BY-SA 3.0
Kosai undo koen
Kosai undo koen · Wakadanari, CC BY-SA 4.0
Toyohashi University of Technology 120825
Toyohashi University of Technology 120825 · Umako, CC0
Ochiba Pass
Ochiba Pass · Alpsdake, CC BY-SA 4.0
Araisekisho
Araisekisho · A10ml at Japanese Wikipedia, Public domain
Daigan-ji
Daigan-ji · Yanajin33, CC BY-SA 3.0

Kosai, Japan

湖西市

Kosai is a town of 59,770 people in Shizuoka, Japan, founded in January 1, 1972.

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Population59,770 GeoNames
Local name湖西市
RegionShizuoka
Elevation30 m 98 ft
FoundedJanuary 1, 1972
Time zoneAsia/Tokyo
Land area86.6 km²
Nearest airportShizuoka Airport (FSZ) 62 km

Why visit Kosai

Townapedia lists 40 museums and landmarks, 66 parks and trails, 102 places to eat, 29 places to stay and 13 attractions in and around town.

Highlights include Toyohashi University of Technology, Hamanako Aquatic Experience Center Wotto, 新居関所 and Ōchiwatoge temple ruins.

About Kosai

Kosai (湖西市, Kosai-shi) is a city located in far western Shizuoka Prefecture, Japan. As of 30 June 2019, the city had an estimated population of 57,885 in 24,232 households, and a population density of 668.7 persons per km2. The total area of the city is 85.65 square kilometres (33.07 sq mi).

From the Wikipedia article Kosai, Shizuoka (this version), under CC BY-SA 4.0.

Travel tips from other travellers: Kosai on Wikivoyage (CC BY-SA 4.0).

Things to do13

Toyohashi University of Technology

School · 10.4 km

Higher education institution in Aichi Prefecture, Japan

Open in Google Maps · Wikipedia

Hamanako Aquatic Experience Center Wotto

Zoo and aquarium · 7.6 km

津波ひなんビル

Open in Google Maps

浜松演芸場

Cinema and theater · 7.5 km

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おいでん村

Farm and orchard · 3.1 km

2814, 湖西市

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Lake view tower

Scenic view · 7.5 km

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Mt.kamiishi

Scenic view · 7.1 km

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Waterside Stage

Cinema and theater · 7.3 km

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やぎさん広場

Zoo and aquarium · 3.3 km

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中尾根パラダイス

Scenic view · 7.3 km

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宇津山

Scenic view · 6.2 km

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嵩山

Scenic view · 5.1 km

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座談山

Scenic view · 7.2 km

Open in Google Maps

1 more on the map.

Museums and landmarks40

新居関所

Monument and historic site · 3.6 km

1227-5, 湖西市新居町新居

Open in Google Maps · Wikipedia · 053-594-3615

Ōchiwatoge temple ruins

Monument and historic site · 9.7 km

Archaeological site in Kosai, Japan

Open in Google Maps · Wikipedia

ドッグラン グリーンリーフ

Monument and historic site · 7.6 km

99-1

Sa-Su 10:00-16:00

Open in Google Maps

豊橋市二川宿本陣資料館

Museum · 7.1 km

Open in Google Maps · Wikipedia

トキワマンサク群生地

Monument and historic site · 5.1 km

静岡県指定天然記念物

Open in Google Maps

宇津山城跡

Monument and historic site · 6.3 km

Open in Google Maps · Wikipedia

豊田佐吉記念館

Museum · 1.2 km

Open in Google Maps · Wikipedia

旧旅籠屋 中屋

Monument and historic site · 3.5 km

1275−2 新居町新居, 湖西市

Open in Google Maps

Arai Barrier gate

Monument and historic site · 3.6 km

Open in Google Maps

あしたの塔

Monument and historic site · 3.8 km

Open in Google Maps

うない松跡

Monument and historic site · 2.3 km

Open in Google Maps

おんやど白須賀

Museum · 2.3 km

Open in Google Maps

28 more on the map.

Parks, trails and playgrounds66

はしくにマリーナ

Marina and boat launch · 6.2 km

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弁天島マリーナ

Marina and boat launch · 7.6 km

Open in Google Maps

新居マリーナ

Marina and boat launch · 3.8 km

Open in Google Maps

新居弁天わんぱくランド

Sports field and stadium · 6.1 km

Open in Google Maps

Friendly Terrace

Park · 7.2 km

Open in Google Maps

弁天島海水浴場

Beach · 7.2 km

Open in Google Maps

Bentenjima Beach Park

Park · 7.4 km

Open in Google Maps

54 more on the map.

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Restaurants and cafes102

弁天島山本亭

Restaurant · Seafood, Unagi, Japanese · 7.4 km

3, 浜松市

11:30-14:30, 16:30-22:00

Open in Google Maps · +81 53 592 1919

浜菜坊

Restaurant · Seafood, Unagi, Japanese · 7.7 km

11:30-14:00,17:00-20:30

Open in Google Maps · +81 53 592 1676

Gomihattin

Restaurant · Chinese · 2.7 km

5, 湖西市

Mo 11:00-23:00

Open in Google Maps · +81 53 489 6218

四季彩

Restaurant · Western · 6.8 km

6, 湖西市

Mo-Su 11:00-14:30,17:30-20:30; Tu off

Open in Google Maps · +81 53 578 2399

Ichikawa Coffee

Cafe · Coffee Shop, Tea · 4.2 km

Mo-Fr 08:00-20:00; Sa-Su 09:00-19:00

Open in Google Maps · 0535776780

うなぎ処 かねはち

Restaurant · Unagi · 3.1 km

We-Mo 11:00+

Open in Google Maps · +81535941274

どoco 弁天島店

Restaurant · Okonomiyaki · 7.5 km

広島お好み焼き。MARGARITA内にある。

We-Su 19:00-24:00

Open in Google Maps

楓林閣

Restaurant · Chinese · 2.8 km

11:00-14:00,17:00-24:00

Open in Google Maps · 053-576-8389

Gusto

Restaurant · 2.3 km

Mo-Fr 08:00-03:00; Sa,Su 07:00-03:00

Open in Google Maps · +81 53 595 0015

HAMASEI

Restaurant · Seafood, Unagi · 6.8 km

Open in Google Maps

LEADER

Restaurant · Burger, American · 7.2 km

Open in Google Maps

Maruasa

Restaurant · Japanese · 3.7 km

Tu-Su 11:30-14:30,17:00-22:30

Open in Google Maps

90 more on the map.

History

The area around Kosai has been noted for the production of Japanese pottery and porcelain since the Kofun period. 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 establishment of the modern municipalities system 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.

From the History section of Kosai, Shizuoka on Wikipedia, under CC BY-SA 4.0.

Where to stay29

Churches and places of worship80

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Shopping26

Gas and EV charging14

Schools, colleges and libraries32

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Healthcare12

Map of Kosai

250 places. The map loads OpenStreetMap tiles when you open it.

Getting there and nearby towns

Shizuoka Airport (FSZ) is the nearest airport with scheduled flights listed in OpenStreetMap, 62 km away.

  • Toyohashi 15 km northwest, about 15 min by car
  • Toyokawa 17 km northwest, about 17 min by car
  • Hamamatsu 19 km east, about 19 min by car
  • Shinshiro 22 km north, about 22 min by car
  • Hamakita 26 km northeast, about 26 min by car
  • Iwata 30 km east, about 30 min by car
  • Gamagōri 30 km northwest, about 30 min by car
  • Fukuroi 36 km east, about 36 min by car
  • Mori 40 km east, about 40 min by car
  • Okazaki 43 km northwest, about 43 min by car

Drive times are estimates from straight-line distance, not routes.

Reviews, tips and questions

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Sources and licences

Photo credits

Page built November 5, 2026. Spotted a mistake? Tell us or suggest a place.