The sixth is that people hid dotaku in the ground and escaped when a social change took place, such as attacks of a foreign enemy with a significantly different religious background from that of the Japanese island of that time, when dotaku were adored (Takehiko FURUTA).
銅鐸を祭る当時の列島の信仰的背景とは著しく異なる文化を持った外敵が攻めて来た等の社会的な変動が起きた時に、銅鐸の所有者が土中に隠匿して退散したという説（古田武彦等）。