Abstract
This paper considers ninja of Kumamoto domain, using historical materials from Hosokawa clan. These historical materials show that they called “Oshinobinoshū”, who was active around 1628. The leader of ninja was Sukeemon YOSHIDA, his name stands first on the lists of “Oshinobinoshū”.
The order document of ningu（tools used by ninja） was written by Sukeemon YOSHIDA, that has great value as historical materials of ninja. In this document was recorded name of ningu at that time, there were many tools with the same name in “Bansenshūkai” and “Ninpiden”. And this document show that these ningu made by kajiya（blacksmith）. They reconnoitered and attacked on the Hara-jo castle in the Shimabara War. It deserves special
mention that one of them was involved in Shiro AMAKUSAʼs death.
