Iba ruins

Located in Iba, Naka Ward, Hamamatsu City, Shizuoka Prefecture, this archaeological site dates back mainly to the Yayoi to Heian periods. The discovery of the site in 1949 (Showa 24) began with pottery fragments scattered near a naval shell explosion caused by a US military naval shell at the end of World War II. At the time, it attracted attention as the remains of a Yayoi period settlement, but when excavation work by the Hamamatsu City Board of Education began in 1968, not only were the remains of a late Yayoi period settlement surrounded by triple moats discovered, but to the west of the site were also discovered the remains of pit dwellings from the mid-Kofun period and post-hole buildings in the style of government offices from the Ritsuryo period, with a large ditch about 15 meters wide buried in the center. A large amount of Yayoi pottery and crimson-lacquered short-shell-shaped wooden products were excavated from the moat, while Hajiki and Sueki pottery, as well as wooden tablets, ink-written pottery (such as "Fuchikuriya"), and wooden products including votive plaques were excavated from the large ditches, with the presence of wooden tablets from the 7th century being particularly noteworthy. Based on the remains and excavated items, it is believed that this site was part of the ancient county office of Fuchi County in Totomi Province and Kurihara Station House. It was designated a prefectural historic site in 1979, but the designation was removed in 1973 due to the completion of the Tokaido Main Line elevation project. Part of the site is open to the public as Iba Ruins Park, and there is also the Iba Ruins Museum (a branch of Hamamatsu City Museum).

[Kosaka Koji]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

静岡県浜松市中区伊場にある弥生(やよい)～平安時代を中心とする遺跡。第二次大戦末期の米軍による艦砲弾爆裂孔付近に散乱した土器片が、1949年（昭和24）に遺跡発見の端緒となった。当時は弥生時代集落跡として注目されたが、68年から浜松市教育委員会による発掘調査が始まると、三重の環濠(かんごう)を巡らした弥生時代後期の集落跡だけでなく、その西方一帯に古墳時代中期の竪穴(たてあな)住居跡群や律令(りつりょう)期の官衙(かんが)的掘立て柱建物跡群が検出され、中央部に幅約15メートルの大溝が埋没していた。環濠から大量の弥生土器や丹塗(にぬり)短甲状木製品が、また大溝から土師器(はじき)や須恵器(すえき)のほか木簡(もっかん)、墨書(ぼくしょ)土器（「布知厨(ふちくりや)」など）、絵馬を含む木製品などが多く出土し、とくに7世紀代の木簡の存在が注目された。遺構や出土品からみてこの遺跡は、古代の遠江(とおとうみ)国敷智(ふち)郡の郡衙(ぐんが)および栗原駅家(くりはらのうまや)の一部であったと推定される。54年県史跡に指定されたが、東海道本線高架化事業遂行のため73年に指定解除された。遺跡の一部は伊場遺跡公園として公開され、伊場遺跡資料館（浜松市博物館分館）もある。

［向坂鋼二］

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