日本法学第八十七巻第二号（二〇二一年九月）五八四 The Influence of Christian Thomasius on the Private Law System in Kant’s Doctrine of Right Takashi Izumo* 1 ．Introduction This study aims to explain the extent to which Immanuel Kant （1724– 1804）deeply understood jurisprudence by referring to several jurists whose works Kant privately possessed or whose names were cited in those works, especially the infuence of Christian Thomasius （1655–1728） on Kant’s Doctrine of Right（in German: Rechtslehre, 17c7）from a legal history viewpoint. In his lecture at the University of Königsberg, Kant famously alluded to the ffth edition of Gottfried Achenwall’s （171c–1772）Natural Law （in Latin: Jus Naturae） . （1） Scholars have since compared it with the （＊） Associate Professor at Nihon University College of Law, Tokyo, Japan. This work was supported by JSPS KAKENHI Grant–in–Aid for Early– Career Scientists Number JP20K13307. In terms of citation and abbreviation, this study basically follows “Hinweise für Autoren_2019” of Kant–Studien. <https://www.degruyter.com/journal/key/KANT/html> accessed on May 1, 2021. The author would like to thank MARUZEN-YUSHODO Co., Ltd. (https://kw.maruzen.co.jp/kousei-honyaku/) for the English language editing. （1） Achenwall, Gottfried: Natural Law. Edited by Kleingeld, Pauline, translated by Vermeulen, Corinna. London 2020, xiii. In this study, for citing Achenwall, each part number is given in Roman numerals and each paragraph number in Arabic numerals （e.g., Pars 1, §1 will be described as I1） . 論　説 ） 六 七 四 （ 1