- 2021 - 2025 Reconstruction of the History of Cultural Exchange in the Muromachi and Sengoku Periods: A Study of the Formation Process of the "Higashiyama Illusion"
- 2019 - 2024 前近代海域ヨーロッパ史の構築:河川・島嶼・海域ネットワークと政治権力の生成と展開
- 2017 - 2021 日本中世貨幣史の再構築-学際的な中世貨幣学の確立に向けて
- 2017 - 2021 Historical Research on Sesshu Toyo
- 2014 - 2018 An Integrated Research of Humanities and Informatics for Shared Resources and Multiple Analyses on the Experience-based Knowledge of Historical Letters
- 2015 - 2018 The Red-seals Ships in the Asian Settings: State Letters and Envoys Sent To And From Japan in the Sixteenth and the Seventeenth Centuries
- 2011 - 2016 A positive research for accumulation, international intercourse and transmission of Classics in the Sinosphere
- 2013 - 2016 Genealogical Research on the Early Modern Document Paper Form and Quality
- 2013 - 2016 Intercultural Exchanges between Medieval Japan and East Asia: Introduction, Translation, and Conjugation
- 2010 - 2013 Diplomacy and Intercultural Contacts in Pre-modern East Asia: A Comparative Historical Research with a special focus on Sino-Japanese Relations during the Ming Period
- 2009 - 2012 Basic study on diplomatic protocol and "Chinese"Things Culture of the Muromachi Shogunate
- 2008 - 2011 Studies on forms and materials of administrative documents from East Japan and Asian regions in the pre-modern era
- 2006 - 2009 海域史・国際交流史研究からみた中世日本の非文字知の世界
- 2006 - 2009 The Study of Oral Traditions (collective wisdom or tacit knowledge) : Time, Calendar, Transportation, Communication, and Distribution in the middle ages (12th~16th)
- 2005 - 2009 Comprehensive Study of Japan-China(Ming) Relation in the Ningbo Area -through Comprehensive Analysis of the Diaries Written by the Missions to Ming-
- 2005 - 2007 Extending and Re-interpreting Historical Sources in the Maritime Region History of East Asia : Historical Maps, Impostor Interaction and Literary Texts
- 2000 - 2001 中世日本・東アジアの国家・地域と対外関係
- 1998 - 1999 中世後期(14〜16世紀)日本列島をめぐる対外関係とアジア国際体系の研究。
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