Lead isotope ratios of 9 T'ang and Sung mirrors, 5 small Japanese mirrors made in the Yayoi period (ca. 3rd-century BC-ca. 3rd-century AD), 18 Dotaku (bell-like objects), 4 swords, 4 halberds, 3 arrowheads, 3 Shang and Han vessels, and 3 Japanese bronze objects were determined by mass spectrometry. The objects showing the isotope ratios similar to the West Han mirrors included 17 Dotaku (except for one unearthed at Kono, Kishiwada city, Osaka prefecture), 3 swords, 2 halberds, and 1 arrowhead. T'ang and Sung mirrors, and 2 arrowheads showed the values similar to East Han mirrors. The Shang vessels showed the values different from those of West Han mirrors. The Dotaku of Kono showed the values of Korean leads. The Japanese bronze objects, a lead plate, a bronze spire of the Suguro temple pagoda, and a mirror with ten small bells, showed the values of Japanese galena ores. -- AATA