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Ken　Negishi

    Department of Law　Associate Professor
    Institute of Social Sciences　Researcher
    Course of Private Law　Associate Professor
Last Updated :2025/05/30

Researcher Information

Degree

  • Doctor of Laws（2018/03 Tohoku University）

J-Global ID

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]
  • 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

  • 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
  • 根岸 謙  The Journal of Law, Tohoku University  (46)  95  -97  2016
  • 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

Committee Membership

  • 2023/04 - Today   Japan Adult Guardianship Law Association   Secretary
  • 2018/10 - Today   Japan Adult Guardianship Law Association   Case Study Committee

Other link

researchmap