The lead isotope ratios of following Japanese and Chinese archaeological bronze objects were determined: 6 early Han mirrors, 11 late Han and other dynasty mirrors, 23 triangular-rimmed mirrors attributed to Wei, 6 mirrors made in Japan as copies of Chinese mirrors, 7 dotaku (Japanese bell-like objects), 2 arrowheads, 9 samples of the Horyuji pagoda and 1 sample of the pedestal of the main image of the Yakushiji temple. In addition 17 Japanese, 2 Chinese and 2 Korean galena ores were studied for their isotope ratios and the results were compared. The isotope ratios of the early Han and some late Han mirrors form the group (C) separated from that of the other late Han mirrors (B). The triangular-rimmed mirrors which are found only in Japanese tombs have isotope ratios similar to this B group. On the other hand Japanese dotaku and arrowheads show similar isotope ratios to those of the early Han mirrors, suggesting raw materiais with the similar isotope ratios. The spire of the Horyuji pagoda and the pedestal of the main image of the Yakushiji temple show similar isotope ratios with Japanese galena ores (group A). -- AATA