Because ruins were less often excavated and neither were bronze wares before, there used to a biased distribution where dohoko were found mainly around northern Kyushu while dotaku were discovered in the area between Kinki and Tokai region.
かつては遺跡が発掘される事自体が少なく、青銅器の出土量も少なかったため、銅矛は主に北九州周辺、銅鐸は近畿から東海地方にかけての地域で出土するという偏りがあった。