Aioi 相生市 | |
|---|---|
Aioi City Hall | |
Location of Aioi in Hyōgo Prefecture | |
| Coordinates:34°48′N134°28′E / 34.800°N 134.467°E /34.800; 134.467 | |
| Country | Japan |
| Region | Kansai |
| Prefecture | Hyōgo |
| Government | |
| • Mayor | Yoshiki Taniguchi (since May 2000) |
| Area | |
• Total | 90.40 km2 (34.90 sq mi) |
| Population (May 31, 2022) | |
• Total | 28,208 |
| • Density | 312.0/km2 (808.2/sq mi) |
| Time zone | UTC+09:00 (JST) |
| City hall address | 1-1-3 Asahi, Aioi-shi, Hyōgo-ken 678-8585 |
| Website | Official website |
| Symbols | |
| Flower | Cosmos |
| Tree | Camellia |

Aioi (相生市,Aioi-shi) is acity inHyōgo Prefecture, Japan. As of 31 May 2022[update], the city had an estimatedpopulation of 28,208 in 13143 households and apopulation density of 310 persons per km2.[1] The total area of the city is 90.4 square kilometres (34.9 sq mi).
Aioi is located in southwestern Hyōgo Prefecture extending largely south to north. The city's northern region is mountainous, the southern region faces theSeto Inland Sea.The area around the urban center, with Mt. Minosan in the north, Mt. Tengadai in the east, and Mt. Miya in the west, is a basin surrounded by small mountains.
Hyōgo Prefecture
Aioi has aHumid subtropical climate (KöppenCfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Aioi is 15.0 °C. The average annual rainfall is 1519 mm with September as the wettest month. The temperatures are highest on average in August, at around 26.0 °C, and lowest in January, at around 4.6 °C.[2]
Per Japanese census data,[3] the population of Aioi has remained relatively constant over the past 70 years.
| Year | Pop. | ±% |
|---|---|---|
| 1950 | 35,894 | — |
| 1960 | 36,521 | +1.7% |
| 1970 | 40,657 | +11.3% |
| 1980 | 41,498 | +2.1% |
| 1990 | 36,871 | −11.1% |
| 2000 | 34,320 | −6.9% |
| 2010 | 31,171 | −9.2% |
The Aioi area was part of ancientHarima Province and was located on theSan'yō highway linking western Japan with theKinai region. The area was the location of a stronghold of the Ebina clan, originally fromSagami Province, who were retainers of the powerfulAkamatsu clan. In theEdo period, the area became part of the holdings ofAkō Domain. The village of Ō (相生村,Ōmura) was established with the creation of the modern municipalities system on April 1, 1889. It was raised to town status on January 1, 1913, becoming Ō (相生町,Ō-chō). The town merged with the neighboring town of Naba on April 1, 1939, and the reading of thekanji of its name was officially changed to "Aioi" on April 13, 1939. It was raised to city status on October 1, 1942. Aioi merged with the villages of Wakasano and Yano on April 1, 1954.
Aioi has amayor-council form of government with a directly elected mayor and aunicameral city council of 14 members. Aioi contributes one member to theHyogo Prefectural Assembly. In terms of national politics, the city is part of Hyōgo 12th district of thelower house of theDiet of Japan.
Aioi has traditionally been famous for shipbuilding, which, despite many years of decline, still maintains a strong presence throughIshikawajima-Harima Heavy Industries (IHI). The city is increasing becoming abedroom community, with 25.0% of those commuting to work going to Tatsuno or Himeji. (2010 National Census).
Aioi has seven public elementary schools and three public middle schools operated by the city government and two public high schools operated by the Hyōgo Prefectural Department of Education. There is also one private high school.
JR West –San'yō Main Line /Akō Line

In November 2005, the city was mentioned in world news reports after a largedaikon radish that grew though the pavement was found slashed.[4][5] According to a city spokesperson, the radish was seen as an inspiration due to "its tenacity and strong will to live."[6] Efforts were undertaken to propagate the radish from acutting, as well as to harvest the plant's DNA.[4] The tenacious daikon, nicknamed "Daichan," has since been celebrated in a children's book.[7] In 2006, a special firework representing the daikon was set off at the annual firework display preceding the dragon boat races.[8]
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