However, with an expansion of excavation this theory is now viewed in a negative light because of more bronze spearheads and bronze swords being found in the region of the 'bronze bell cultural area' and, on the other hand, more bronze bells and their molds being found within the 'bronze spearheads cultural area' such as Yoshinogari Ruins.
しかし、発掘される遺跡の増加に伴い、「銅鐸文化圏」の地域で銅矛や銅剣が、吉野ヶ里遺跡のような「銅矛文化圏」内で銅鐸や銅鐸の鋳型が出土するといったことが増えたことから、今では否定的に見られている。