In and after the first half of the middle of the Yayoi period, manufactured weapon type bronze ware such as bronze swords, doka (bronze halberd for ritual) and bronze halberds gradually increased in thickness.
弥生時代中期前半以降、銅剣・銅矛・銅戈などの武器形青銅器は、徐々に太く作られるようになったと理解できる。