The production location and significance of the “inscription sword”owned by the National Museum of Tokyo, Japan.

On January 23, 2017, I investigated the inscription sword(有銘環頭大刀) housed in the National Museum of Tokyo. In this paper, based on the various facts and reports obtained at the time, the manufacturing process of the sword was restored, and the production location, the year of manufacture, and historical significance were examined. As a result, it was found that it was highly likely that the inscription sword was made in Daegaya(大加耶) in the late 5th century. In addition, through the inscription word, we could get a glimpse of the writing level of Daegaya at that time and the technology of Daegaya that was spread to the Japanese archipelago. In the background, it can be seen that there was a high political development of Daegaya, which was established until the territorial state stage in the late 5th century.