太平洋に面する標高15mの晩成海岸段丘上に南北約2kmにわたってつくられた先住民族の一大住居集落で、周辺に約130ヵ所も分布しています。
現在は一辺の長さ5m前後、深さ50㎝から1mの竪穴のみが残っている状態ですが、復元された住居も展示しています。
擦文式土器や金属器、動物骨格などが出土しており、擦文文化を究明する上で貴重な遺跡となっています。
昭和41年7月7日に北海道指定文化財に指定されています。
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【Tokachi Horokayanto Pit Group】
Near Horokayanto, there are some remains of pit dwellings that were built approximately 1,000 years ago during the Satsumon culture.
These were large aboriginal dwellings on the 15-meter-high Bansei coastal terrace facing the Pacific Ocean. Its length was approximately 2 km from north to south, and there are approximately 130 of them in the surrounding area.
Today, only a pit about 5m in length and 50cm to 1m in depth remains, but a reconstructed dwelling is also on display.
The site is a valuable site for the study of the Satsumon culture, because Satsumon-style earthenware, metalware, and animal skeletons have been unearthed.
The site was designated as a Hokkaido cultural property on July 7, 1966.