The Fudōdō Site (不動堂遺跡, Fudōdō Iseki) is an archaeological site with the ruins of a middle Jōmon period (around 2500 BC) settlement in what is now part of the town of Asahi, Toyama Prefecture in the Hokuriku region of Japan.

[1] The Fudōdō site is located at the eastern margin of the Toyama Plain at the end of a raised alluvial fan on the right bank of the Kurobe River.

Of especial interest was the central part of the ruins, which contained the foundations of a long oval structure measuring 17 meters east-to-west and eight meters north-to-south, making it one of the largest pit dwellings found in Japan.

It is presumed that the building was not an ordinary residence, but served as a public structure, possibility for ceremonial purposes.

It is located about 15 minutes by car from Tomari Station on the JR West Hokuriku Main Line.