- 2023 - 2027 Concealment, Ambiguity and Reservation of the Sence of "Justice" in the Medieval and Early Modern Christian Society
- 2022 - 2025 前近代における危機と専門家の役割--対応・変性・創発についての比較史的研究
- 2020 - 2023 バイアス分析の手法によるドイツ領アフリカ植民地のグローバル・リーガル・ヒストリー
- 2019 - 2022 前近代の専門家を取り巻く「環境」に関する比較国制史的基礎研究
- 2017 - 2020 The Vicissitudes of Concepts of "Right Congition" in Medieval and Early Modern Europe
- 2016 - 2019 Reconstruction of constitutional history from the viewpoint of development of experts and their knowledge
- 2012 - 2016 Comparative Study of Social Order and Process of Change to Feudalism in Japan and Western Europe by Creation of Paleographical Methods
- 2011 - 2015 Imperial power structute in Medieval Western Christendum -- empire, kingdom and land
- 2011 - 2014 Multilateral investigation of continuity and discontinuity of the German federalism : comparative research around the Weimar period
- 2011 - 2014 comparative history of the dispute resolution:judicial and extra-judicial patterns in the premodern society
- 2011 - 2013 Eastern-Asian Context of Reception of the Western Jurisprudence in Modern Japan: New Research on Santaro Okamatsu and Investigation of Old Customs in Taiwan
- 2010 - 2012 "Tradition" and "Construction" in Legal and ConstitutionalHistory - Multi-Layered Approach mainly to the Transitional Periods
- 2008 - 2010 Comparative Studies of the History of Dispute Resolution Pattarns : Ways of Social Arrangement in the Premodern World
- 2007 - 2010 Theoretical-historical comparative study of the empire model and the sovereign state model : interdisciplinary research of the supranational federalism
- 2007 - 2009 Methodological Relocation of the Constitutional History in the Occident and Japan-From the Viewpoint of Historical Source Research and Learning-History.
- 2005 - 2009 A Study on the Creole and the Agency Formation of Law
- 2004 - 2006 "Forms" and Integrating Functions of Law in the West and Japan Comparative Study in Consideration of Studies about Historical Materials and Cultural History
- 2003 - 2005 Sovereignty and Empire, Multilateral Research on the Historical Precondition of the Concept of Sovereignty and its Formation in Germany
- 2002 - 2004 The Creole of Culture and the Structuration of Law---the Exploration and Furtherance of "Comparative Legal Formation"---
- 2002 - 2003 蔵書目録から見た中世ドイツ王国における学識法の普及と意義
- 2001 - 2003 Universal Order, Particular State, and Region : Hoitorical Evolution of We-consciousness and Role of Law
- 2000 - 2001 学識法学と実力行使の接点としての中世後期ドイツ都市刑事手続の多面的考察
- 1998 - 1999 中世後期ドイツ王国の大学--法史・国制史の視点から
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