Abstract
Issuing currency was a big project for a national economy. In order to switch from imported coins from China (toraisen), that were circulating in Japan from the end of the Heian Period, to self-produced coins, the Edo Government started production of Kan'ei-Tsuho bronze coins in 1636. The production of coins was continued until 1659 in fifteen locations, and new coins were circulated quickly. Kan'ei-Tsuho were cast coins (produced by casting melted bronze into a mold, then filed off the edges) and it was important to have enough skills and quality control. In the analysis of Kan'ei-Tsuho bronze coins excavated from a modern period grave at the point B of Miwanoyamadorokujin site, Chiba Prefec-ture, it became clear that the government's quality controlwas quite strict and that they prepared for the development of monetary economy with scrupulous care.
