本研究はJSPS 科研費16J03328の助成を受けたものである。 Kaibara Ekiken (1630-1714), one of the most famous Confucian scholars of the early Edo period is well known for probably being the first Japanese to write a commentary on Zhu Xi's (1130-1200) highly influential introduction to Neo-Confucianism, the Reflections on Things at Hand (Chn. Jinsilu, Jpn. Kinshiroku). A relative early work, completed at the age of 39, Ekiken's commentary the Kinshiroku-bikō uses many quotations from Zhu Xi himself as well as other Confucians in order explicate the text of the Reflections on Things at Hand. While these quotations make up the majority of the text of the commentary, Ekiken also included his own comments on the text. As well as the Kinshiroku-bikō, Ekiken also commented on the Reflections on Things at Hand in a chapter of an unpublished manuscript edition of one of his last works written towards the end of his life, the Shinshiroku. This chapter, titled Kinshiroku-setsu, while only being a relatively short work (it extends to 28 pages in its modern facsimile edition) is still important because unlike the Kinshiroku-bikō it seems to contain mostly Ekiken's own thoughts on the Reflections on Things at Hand. Also as it was apparently written toward the end of Ekiken's life, it can be thought of as containing Ekiken's mature reflections on the Reflections on Things at Hand. Ekiken is thought to have become critical of many of the theories of Neo-Confucianism later in his life, and this is most evident in his work Record of Great Doubts (Taigiroku). It would be interesting to see if this critical stance can also be seen in the Kinshiroku-setsu. Unfortunately however, there is almost no prior research on Ekiken's thought regarding the Reflections on Things at Hand. This paper examines the relationship between Ekiken's Kinshiroku-bikō and Kinshiroku-setsu by looking at the differences of the layout and the chapter headings between both texts. Also it compares Ekiken's explanations in both texts of the first part of the first chapter of the Reflections on Things at Hand, and finds that Kinshiroku-setsu both reorganises and reuses Ekiken's explanations from the Kinshiroku-bikō, while also adding new material as well.