Ken　Negishi

Researcher Information

Degree

• Doctor of Laws（2018/03 Tohoku University）

J-Global ID

• 201801015773194616

Research Interests

• Trust   Contractual Liability   Voluntary Guardianship Contract   fidelity guarantee   Obligational Relationship (Schuldverhältnis)   

Research Areas

• Humanities & social sciences / Civil law

Academic & Professional Experience

• 2023/04 - Today  Toyo UniversityFaculty of LawAssociate Professor
• 2020/04 - 2023/03  Toyo UniversityFaculty of Lawfull-time lecturer
• 2018/04 - 2020/03  Tohoku UniversityGraduate School of LawAssistant professor

Education

• 2015/04 - 2018/03  Tohoku University  Graduate School of Law

Association Memberships

• Japan Adult Guardianship Law Association   THE JAPANESE ASSOCIATION OF LAW AND POLITICAL SCIENCE   JAPAN ASSOCIATION OF PRIVATE LAW   

Published Papers

• The Current State of Legal Reforms on the Lasting Power of Attorney System in England and Wales — Focusing in Particular on the Powers of Attorney Act 2023

  Ken Negishi

  Adult Guardianship Practices (114) 71 - 80 2025/01
• Measures to Prevent the Abuse of Anticipatory Powers of Representation (Vorsorgevollmacht) after the 2021 Amendment of the German Civil Code — Implications for Japanese Law from Professor Anatol Dutta’s Special Lecture

  Ken Negishi

  Adult Guardianship Practices (109) 60 - 68 2024/03
• Recent Trends in Judicial Decisions on Personal Guarantees across Various Fields — With a Focus on Fair Risk Allocation and Coordination in Hospitalization and Similar Contexts

  Ken Negishi

  Adult Guardianship Practices (107) 26 - 35 2023/10
• Structural Defects and Challenges in Japan’s Voluntary Guardianship Contract Law — Focusing on Cases of Abuse of Voluntary Guardianship Contracts

  Ken Negishi

  Japan Space (31) 5 - 32 2022/06 [Refereed][Invited]
  
• Debates on Reforming the Lasting Power of Attorney System in England and Wales — A Consideration for Developing Safeguards against Abuse in Japan’s Voluntary Guardianship System

  Ken Negishi

  Toyo Hogaku (Toyo Law Review) 65 (3) 145 - 174 2022/03
• Outlining the Concept of ‘Common Commercial Practice’ from the Perspective of Obligational Relationships — With Reference to the Legislative Debates on ‘Verkehrssitte’ under Section 242 of the German Civil Code

  Ken Negishi

  HŌGAKU (THE JOURNAL OF LAW AND POLITICAL SCIENCE) 84 (3=4) 139 - 163 2020/12
• The Legal Framework for Housing Construction and Occupancy by German Housing Cooperatives (Wohnungsgenossenschaften) — Based on Selected Case Studies of Cooperative Housing Projects

  Ken Negishi

  Toyo Hogaku (Toyo Law Review) 64 (1) 107 - 132 2020/07
• Rethinking the Concept of Obligational Relationships: Focusing on Its Formation and Manifestation in the Japanese Civil Code (Part 2)

  Ken Negishi

  HŌGAKU (THE JOURNAL OF LAW AND POLITICAL SCIENCE) 83 (2) 43 - 109 2019/09
• Rethinking the Concept of Obligational Relationships: Focusing on Its Formation and Manifestation in the Japanese Civil Code (Part 1)

  Ken Negishi

  HŌGAKU (THE JOURNAL OF LAW AND POLITICAL SCIENCE) 83 (1) 38 - 107 2019/06
• Reconsidering the Concept of Obligational Relationships — With Reference to the German Law Concept of Schuldverhältnis

  Ken Negishi

  Dissertation submitted in fulfillment of the requirements for the degree of Doctor of Philosophy 1 - 169 2018/03 [Refereed]
  
• The Legal Framework for Housing for the Elderly in Sweden — Focusing on Legal Rights Related to Residence

  Ken Negishi; Kazuhiko Taya

  Toyo Hogaku (Toyo Law Review) 東洋大学法学会 59 (2) 295 - 348 0564-0245 2016

Books etc

• Gateway to Specialized Subjects in Law (3rd Edition)

  太矢一彦; 小野上真也; 北岡大介; 根岸謙(編) (Joint workChapter 22. Comparative Tort Law)MARUZEN-YUSHODO Company, Limited 2025/04 9784841941074
• Promise and Contract

  Masaki Sakuramoto; Kazuhiko Taya; Hiroshi Shimizu (Joint translationChapter 6. Contractual Remedies (pp.347-441))Martin Hogg Shinzansya 2024/03 9784797275315
• Gateway to Specialized Subjects in Law (1st Edition)

  井上貴也; 清水宏; 武市周作; 太矢一彦; 根岸謙(編) (Joint workChapter 1. Civil Law)MARUZEN-YUSHODO Company, Limited 2022/09 9784841940534

Conference Activities & Talks

• Trends in Adult Guardianship Legislation in Common Law Jurisdictions (UK (England and Wales), Singapore, Ireland, United States (Model Law), Canada (British Columbia and Alberta), and Australia (Victoria))  [Invited]

  Ken Negishi

  The 22st Academic Conference of the Japan Adult Guardianship Law Association  2025/05  Keynote oral presentation
• Reform Trends of the UK's Mental Capacity Act in Response to the Convention on the Rights of Persons with Disabilities  [Invited]

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Legal Reform  2025/02  Oral presentation
• Contract Design: Current Developments and Legal Analysis

  Ken Negishi

  Privacy Study Group  2024/11  Oral presentation
• Recent Developments in the Reform of Lasting Powers of Attorney in the UK  [Invited]

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Voluntary Guardianship  2024/09
• Validity of an Implied Trust over Funds under the Control of Another Person  [Invited]

  Ken Negishi

  Research Group of the Chuo University Research and Development Initiative  2024/06  Oral presentation
• Reforming the Voluntary Guardianship System: Insights from the Legal Framework of England and Wales  [Invited]

  Ken Negishi

  The 21st Academic Conference of the Japan Adult Guardianship Law Association  2024/05  Nominated symposium
• [Case Commentary] A Case in which an Implied Trust Was Denied Regarding the Management of a Reserve Fund Transferred by the Entrustor to the Trustee under a Currency Exchange Machine Management and Operation Agreement (Osaka High Court, 27 May 2022)

  Ken Negishi

  Chuo University Civil Law Case Study Group  2024/03  Oral presentation
• Legal and Regulatory Issues in Elderly Guarantee Services: A Focus on Legal Problems Concerning Financial Aspects  [Invited]

  Ken Negishi

  Japan Federation of Shiho-shoshi's Associations (Roundtable on Guarantee Services for the Elderly)  2024/01  Invited oral presentation
• Cases Involving the Abuse of Voluntary Guardianship Agreements  [Invited]

  Ken Negishi

  Japan Federation of Certified Public Tax Accountants' Associations (National Unified Training Seminar)  2023/01  Invited oral presentation
• [Case Commentary] On the Public Policy Validity of Donatio Mortis Causa Agreements Concluded with Elderly Support Service Providers (Nagoya High Court, 22 March 2022)

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Case Study  2022/10
• Key Considerations When Entering into Voluntary Guardianship Agreements—Based on Abuse Cases  [Invited]

  Ken Negishi

  Tokyo Certified Public Tax Accountants Association (Training for Adult Guardianship Candidates)  2021/10  Invited oral presentation
• [Case Commentary] On the Public Policy Validity of a Donatio Mortis Causa Agreement Integrated with a Guarantee Agreement — Focusing on the Structure of the Public Policy Violation Analysis (Nagoya District Court, Okazaki Branch, 28 January 2021)

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Case Study  2021/05  Oral presentation
• [Case Commentary] Validity of a Withdrawal by a Voluntary Guardian from the Ward’s Bank Account under the Name "Voluntary Guardian" in a Transitional-Type Voluntary Guardianship Agreement (Tokyo District Court, 26 March 2018)  [Not invited]

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Case Study  2019/10  Oral presentation
• [Case Commentary] Mental Capacity at the Time of Entering into a Voluntary Guardianship Agreement (Tokyo District Court, 29 June 2016)  [Not invited]

  Ken Negishi

  Japan Adult Guardianship Law Association – Committee on Case Study  2019/03  Oral presentation
• Case Law Analysis on Voluntary Guardianship Agreements Related to Real Estate Sales  [Not invited]

  Ken Negishi

  Urban Land Use Study Group  2018/12  Oral presentation
• Reconsidering the Concept of Obligation — With Reference to the German Concept of Schuldverhältnis  [Not invited]

  Ken Negishi

  Tohoku University Civil Law Research Group  2017/11  Oral presentation
• The Legal Framework for Housing for the Elderly in Sweden  [Not invited]

  Ken Negishi

  Toyo University Law Association  2015/12  Oral presentation
• [Case Commentary] Provisional Attachment Based on the Right of Anticipatory Reimbursement as the Secured Claim and the Interruption of the Limitation Period for a Subsequent Reimbursement Claim (Supreme Court, 17 February 2015)  [Not invited]

  Ken Negishi

  Tohoku University Civil Law Research Group  2015/11  Oral presentation

MISC

• The Settlor’s Intention and Mental Capacity at the Time of Adding Trust Property (Yokohama District Court Judgment, 15 December 2023)

  Ken Negishi  SHINTAKU Forum (Trust Forum)  (22)  69  -74  2024/10
• Whether an Implied Trust Was Established Regarding the Management of Funds Inside a Currency Exchange Machine under a Currency Exchange Machine Management and Operation Outsourcing Agreement (Osaka High Court Judgment, 27 May 2022)

  Ken Negishi  Horitsu no Hiroba (The Law Forum)  77-  (5)  102  -109  2024/10
• Insights from the ‘Overview of Adult Guardianship Cases (January–December 2023)’ and ‘Cases of Misconduct by Guardians’

  Ken Negishi  Adult Guardianship Practices  (111)  98  -100  2024/07
• Legislation on the Lasting Power of Attorney System in England and Wales (Part 1)

  Ken Negishi  Toyo Hogaku (Toyo Law Review)  67-  (3)  331  -363  2024/03
• The Public Policy Validity of a Gift Mortis Causa Contract Concluded with an Elderly Support Service Provider Acting as a Guarantor (Nagoya High Court Judgment, 22 March 2022)

  Ken Negishi  Adult Guardianship Practices  (103)  105  -114  2023/03
• Review of Adult Guardianship Case Law (2017–2018)

  Ken Negishi  Adult Guardianship Law Review  (19)  241  -245  2022/06
• The Public Policy Validity of a Gift Mortis Causa Integrated with an Elderly Guarantor Contract — Focusing on the Analytical Framework for Determining Violation of Public Policy (Nagoya District Court, Okazaki Branch Judgment, 28 January 2021)

  Ken Negishi  Adult Guardianship Practices  (94)  89  -97  2021/08
• Review of Adult Guardianship Case Law (2015–2016)

  Ken Negishi  Adult Guardianship Law Review  (18)  102  -130  2021/03
• [Translation] Lecture by Daniel Koh (Judge of the Singapore Family Court and the First Public Guardian) — Guardianship and Trusts in the Law of Mental Capacity

  Ken Negishi  Adult Guardianship Law Review  (18)  45  -51  2021/03
• Legal Issues Arising from the Abuse of Transitional Voluntary Guardianship Contract (Tokyo District Court Judgment of March 26, 2018)

  Ken Negishi  Adult Guardianship Practices  (85)  82  -90  2020/03
• [Translation] Lecture by Denzil Lush (Former Senior Judge of the Court of Protection, England) — Adult Guardianship and Private Autonomy: Cases of Abuse in Voluntary Guardianship and Trusts

  Ken Negishi  Adult Guardianship Law Review  (17)  107  -115  2020/01
• Method of Determining Mental Capacity at the Time of Entering into a Voluntary Guardianship Contract (Tokyo District Court Judgment of June 29, 2016)

  Ken Negishi  Adult Guardianship Practices  (82)  64  -73  2019/09
• Repositioning the Concept of Obligation Relationship (Schuldverhältnis)

  根岸 謙  The Journal of Law, Tohoku University  (46)  95  -97  2016
• Provisional Attachment Securing an Anticipatory Right of Reimbursement and the Interruption of Limitation Period for a Subsequent Reimbursement Claim (Supreme Court Judgment, February 17, 2015)

  Ken Negishi  法学  80-  (3)  384  -394  2016

Awards & Honors

• 2018/03 Tohoku University President's Award
   

  受賞者: 根岸 謙

Research Grants & Projects

• Reconstructing Legal Norms to Prevent Abuse in Property Management and Succession Contracts for the Elderly

  Japan Society for the Promotion of Science (JSPS)：Grant-in-Aid for Scientific Research (Early-Career Scientists)

  Date (from‐to) : 2025/04 -2028/03 

  Author : 根岸 謙
• Developing Indicators Based on Derivative Regulations Arising from the Cap on Maximum Liability in Personal Guarantee Contracts

  Toyo University：Enryo Inoue Memorial Research Grant

  Date (from‐to) : 2024/06 -2025/03
• Determining the Existence of Trust Contracts in Implicit Monetary Deposit Transactions

  Amakasu Memorial Trust Research Grant for the Public Interest Trust

  Date (from‐to) : 2024/04 -2025/03
• Developing a Model Voluntary Guardianship Agreement through Analysis of Abuse Cases

  Toyo University：Enryo Inoue Memorial Research Grant

  Date (from‐to) : 2022/04 -2023/03 

  Author : 根岸謙
• Legal and ICT Perspectives on Building a Decentralized Ledger-Based Voluntary Guardianship System: A Study and Practical Implementation

  Foundation for the Promotion of Electrical Communication (FPEC)：Research Grant

  Date (from‐to) : 2021/04 -2023/03 

  任意後見契約にかかわる各プレーヤーが分散型台帳システム上のネットワークに参加することで高齢者の意思能力の有無の程度を適時に反映させ，経済的虐待を防ぐ技術的方策の構築を試みることで，新たな情報通信技術と今日的な財産法制の在り方を検討する。
• Structuring the Framework of the Concept of Obligational Relationships

  Japan Society for the Promotion of Science (JSPS)：Grant-in-Aid for Scientific Research (Early-Career Scientists)

  Date (from‐to) : 2019/04 -2022/03 

  Author : 根岸 謙
• An Analysis of the Interests and Expectations of Contracting Parties in Voluntary Guardianship Agreements: Toward a System Truly for Individuals with Dementia

  The Mitsubishi Foundation：Social Welfare Research Grant

  Date (from‐to) : 2019/10 -2021/09 

  Author : 根岸 謙
• Examining the Usefulness of the Cooperative Model in Housing Acquisition and Construction — With Reference to Legal Theories of Housing Cooperatives in Germany

  Institute for the Advancement of Nonprofit and Cooperative Studies “Inochi to Kurashi” (NPO)：Research Grant

  Date (from‐to) : 2018/07 -2020/06 

  Author : 根岸 謙

Committee Membership

• 2025/05 - Today   Japan Adult Guardianship Law Association   Board Member
• 2018/10 - Today   Japan Adult Guardianship Law Association   Case Study Committee

Other link

researchmap

https://researchmap.jp/KenNegishi