Research activity information

• A Reflection on Japan’s ‘Justice Affairs Diplomacy’

  Jason Ho Ching Cheung, Kazuaki Nishioka

  Abstract This article examines Japan’s ‘Justice Affairs Diplomacy’ and the role of international dispute resolution in Japan’s diplomatic strategy. In recent decades, Japan has sought to position itself as a hub for international arbitration through legal reforms and institutional initiatives, including accession to the New York Convention, ratification of the Singapore Convention on Mediation and revisions to its Arbitration Act. Despite these developments, the diplomatic implications of Japan’s dispute resolution initiatives remain underexplored. This article asks how Japan’s promotion of arbitration and alternative dispute resolution contributes to its broader diplomatic posture. By examining legal reforms, institutional initiatives and developments such as Shift Energy and Others v. Japan , it argues that arbitration functions not only as a mechanism of commercial governance but also as a diplomatic instrument through which Japan projects legal influence and engages regional and global actors.

  Walter de Gruyter GmbH, Jul. 2026, The Hague Journal of Diplomacy, 21(3) (3), 573 - 585

  [Refereed]

  Scientific journal


• Sports-related Disputes and Arbitration in Japan: Japan Sports Arbitration Agency and its Arbitration Rules

  Kazuaki Nishioka, Michael Weber

  Jul. 2025, Istanbul Journal of Sports Law, 7(1) (1), 1 - 33, English

  [Refereed][Invited]

  Scientific journal


• New Arbitration Settings in Japan: Recent Developments and ‘Justice Affairs Diplomacy’

  Kazuaki Nishioka

  May 2025, Journal of International Trade and Arbitration Law (ULUSLARARASI TİCARET VE TAHKİM HUKUKU DERGİSİ), 14(2) (2), 343 - 373, English

  [Refereed][Invited]

  Scientific journal


• 仲裁手続の効率性と手続保障 : スイスにおける近時の法発展を中心に

  西岡 和晃

  東京 : 国際私法学会 ; 1999-, Dec. 2024, 国際私法年報 = Japanese yearbook of private international law, (26) (26), 117 - 138, Japanese

  [Refereed]


• Recent Amendment of Japanese Arbitration Law: A Bright Future Waiting for Japan?

  Kazuaki Nishioka

  Sep. 2024, ASA Bulletin, 42(3) (3), 519 - 535, English

  [Refereed]


• How Can International Arbitration in Japan Take Flight?

  Kazuaki Nishioka

  May 2022, Journal of Japanese Law, 27(53) (53), 255 - 270, English

  [Refereed]

  Scientific journal


• The enforcement of cross-border competition law claims in Asia-pacific and choice of forum agreements: private litigation or arbitration?

  Kazuaki Nishioka

  A private plaintiff may bring an action against a defendant for the infringement of competition law. In Western countries, it is widely accepted that parties can subject to choice of forum agreements claims seeking private law remedies based on competition law infringements. Accordingly, parties are free to refer those claims to a foreign court or arbitral tribunal for their determination. In contrast, it remains an open question in most Asia-Pacific jurisdictions whether competition-related claims are subject to choice of forum agreements (in particular, an arbitration agreement). If the answer is affirmative, a number of incidental questions will arise. For instance, in what kinds of competition-related claims and under what circumstances will choice of forum agreements be applicable? With focus on international arbitration, this article will look into recent developments around the globe and then propose how states in the Asia-Pacific region should approach those issues.

  Oxford University Press (OUP), Jan. 2022, Journal of Antitrust Enforcement, 10(2) (2), 279 - 302, English

  [Refereed]

  Scientific journal


• Choice of court agreements and derogation from competition law

  Kazuaki Nishioka

  Informa UK Limited, May 2020, Journal of Private International Law, 16(2) (2), 300 - 319

  [Refereed]

  Scientific journal


• New York Convention and Competition Law Claims : Law Applicable to Arbitrability and Public Policy

  西岡 和晃

  国際法学会 ; 1912-, Jan. 2020, 国際法外交雑誌 = The Journal of international law and diplomacy, 118(4) (4), 507 - 531, Japanese

  [Refereed]


• International scope of the Japanese Anti-monopoly Act in cross-border cartel cases: a Japanese approach to ‘extraterritorial application’

  Kazuaki Nishioka

  Most states have a national anti-trust or competition law to regulate anti-competitive activities. There is no doubt that, in purely domestic cases, where an anti-competitive activity and its anti-competitive effects have occurred within a state, that state’s national competition authority can regulate the activity by applying its competition law. For cross-border cases such as where anti-competitive activities are carried out abroad but have anti-competitive effects on the domestic or internal market of that state or region, it has been gradually accepted that a state can apply its competition law to the activities on the basis of the effects within its territory. However, it should be noted that states have approached such cases differently. In 2017, the Supreme Court of Japan first decided the international scope of the Japanese Anti-Monopoly Act (JAMA) in cross-border cartel cases and clarified that the JAMA could apply to anti-competitive activities conducted outside of Japan if the activities in question disturbed the free competition economic order of Japan. The court did not mention the effects doctrine or the territorial principle. This article examines on what grounds and how far the JAMA can and should apply to cross-border cartel cases by analysing the Supreme Court judgement.

  Oxford University Press (OUP), Nov. 2019, Journal of Antitrust Enforcement

  [Refereed]

  Scientific journal


• Competition Law Claims and Choice of Court Agreements

  西岡 和晃

  国際商取引学会, 2018, 国際商取引学会年報, (20) (20), 69 - 81, Japanese

  [Refereed]


• Some Conflict-of-Laws Issues in the Area of Antitrust Law in the U.S

  西岡 和晃

  国際商取引学会, 2017, 国際商取引学会年報, (19) (19), 77 - 88, Japanese

  [Refereed]


• Recognition and Enforcement of Foreign Judgments in Relation to Competition Law Claims

  西岡 和晃

  日本国際経済法学会 ; 1995-, 2016, 日本国際経済法学会年報, (25) (25), 94 - 110, Japanese

  [Refereed]


• The Law Applicable to Acts Restricting Free Competition : Suggestions from Discussions in EU and Switzerland

  西岡 和晃

  国際私法学会 ; 1999-, 2015, 国際私法年報 = Japanese yearbook of private international law, (17) (17), 157 - 179, Japanese

  [Refereed]


• Damages for Infringements of Competition Law Provisions : Study on the Legal System in EU and Switzerland

  西岡 和晃

  国際商事法研究所, 2015, 国際商事法務, 43(5) (5), 707 - 714, Japanese


• The Place of Tort as a Ground for International Jurisdiction in Competition Law Cases

  Nishioka Kazuaki

  研究ノート(Note)

  Alternative:The Doshisha Law Association, Nov. 2014, 同志社法学, 66(4) (4), 985 - 1051, Japanese

• Tokyo District Court, Judgment, May 9, 2022

  Kazuaki Nishioka

  Feb. 2025, Japanese Yearbook of International Law, 67, 594 - 596, English


• Tokyo District Court, Judgment, March 23, 2022

  Kazuaki Nishioka

  Feb. 2024, Japanese Yearbook of International Law, 66, 569 - 576, English


• Intellectual Property High Court, Judgment, July 20, 2022

  Kazuaki Nishioka

  Feb. 2024, Japanese Yearbook of International Law, 66, 561 - 564, English


• Supreme Court (3rd Petty Bench), Judgment, 25 May 2021

  Kazuaki Nishioka

  Feb. 2023, Japanese Yearbook of International Law, 65, 423 - 425


• Tokyo District Court, Judgment, 12 February 2020

  Kazuaki Nishioka

  Feb. 2023, Japanese Yearbook of International Law, 65, 430 - 432, English


• Tokyo High Court, Judgment, 22 July 2020

  Kazuaki Nishioka

  Feb. 2022, Japanese Yearbook of International Law, 64, 318 - 322, English


• Tokyo District Court, Judgment, March 26 2018

  Feb. 2021, Japanese Yearbook of International Law, 63, 370 - 373

  [Refereed]


• 渉外家事事件判例評釈(82)法定相続分につき日本民法と異なる割合を定める韓国民法の適用について,通則法42条の公序違反が認められないとした事例[東京地裁平成28.8.16判決]

  西岡 和晃

  日本加除出版, Mar. 2020, 戸籍時報, (793) (793), 28 - 34, Japanese


• Supreme Court (1st Petty Bench), Judgment, 15 March 2018

  Lead, Feb. 2020, Japanese Yearbook of International Law, 62, 452 - 455

  [Refereed]


• 文献紹介 種村佑介『国際不法行為法の研究』

  西岡 和晃

  日本国際経済法学会 ; 1995-, 2019, 日本国際経済法学会年報, (28) (28), 283 - 287, Japanese


• 渉外判例研究(Number 667)外国で締結された国際カルテルへの独禁法の適用を肯定した事例[最高裁平成29.12.12判決]

  西岡 和晃

  有斐閣, Dec. 2018, ジュリスト = Monthly jurist, (1526) (1526), 142 - 145, Japanese

  [Refereed]


• Supreme Court (3rd Petty Bench), Judgment, 12 December 2017

  Lead, 2018, Japanese Yearbook of International Law, Vol, 61, 399 - 402


• 最近の判例 RJR Nabisco, Inc. v. European Community, 136 S. Ct. 2090 (2016) : 外国で生じた事実に対するRICO法の域外適用が肯定されるも,外国損害に対するRICO法の域外適用が否定された事例

  日米法学会, Oct. 2017, アメリカ法, 2017(1) (1), 157 - 161, Japanese


• Tokyo District Court, Interim Judgment, 15 February 2016

  2017, Japanese Yearbook of International Law, 60, 523 - 525


• Supreme Court (1st Petty Bench), Judgment, 10 March 2016

  2017, Japanese Yearbook of International Law, 60, 488 - 490


• Doshisha University Private International Law Research Group : The Law Applicable to Tort and Product Liability Arising upon the High Seas

  Nishioka Kazuaki

  判例研究(Case Study)

  Alternative:The Doshisha Law Association, Sep. 2014, 同志社法学, 66(3) (3), 863 - 877, Japanese

• Multinationals and Human Rights in Asia

  Kazuaki, Nishioka, Jason, Ho Ching Cheung

  Joint editor, Hart Publishing, Apr. 2026


• Choice of law and recognition in Asian family law

  Reyes, Anselmo, Lui, Wilson, Kazuaki, Nishioka

  Joint editor, Hart Publishing, Oct. 2023, English, ISBN: 9781509956340


• Treatment of foreign law in Asia

  Kazuaki Nishioka

  Editor, Hart, Oct. 2023, English, ISBN: 9781509956555


• 国際私法判例百選［第3版］

  道垣内, 正人, 中西, 康

  Contributor, 執行判決訴訟における相殺の抗弁, 有斐閣, Nov. 2021, Japanese, ISBN: 9784641115569


• Japanese private international law

  Kazuaki Nishioka, Yuko Nishitani

  Joint work, Hart, Nov. 2021, English, ISBN: 9781509924295


• Direct jurisdiction : Asian perspectives

  Reyes, Anselmo, Lui, Wilson

  Contributor, Chapter 5: Japan, Hart, Nov. 2021, English, ISBN: 9781509936427


• 新・ケースで学ぶ国際私法

  野村, 美明, 高杉, 直, 長田, 真里

  Joint work, 第22章 個別の物権問題, 法律文化社, 2020, Japanese, ISBN: 9784589040770


• Recognition and enforcement of judgments in civil and commercial matters

  Reyes, Anselmo

  Joint work, Chapter 5: Japan, Hart, 2019, English, ISBN: 9781509924257

• 仲裁手続の効率性と手続保障―スイスでの議論を中心に―

  西岡 和晃

  国際私法学会第136回大会(2023年), Jun. 2023, Japanese

  [Invited]

  Oral presentation


• Cross-Border Enforcement of Competition Law: From a Japanese Perspective

  Kazuaki Nishioka

  International Seminar on Cross Border Enforcement of Competition Law, Faculty of Law, Universitas Brawijiya, Indonesia, Sep. 2019, English

  [Invited]

  Public discourse


• Choice of Court Agreements and Derogation from Competition Law: from a Japanese Perspective

  Kazuaki Nishioka

  Centre du droit de l’entreprise de l’Université de Lausanne (Lausanne), Switzerland, May 2019, English

  [Invited]

  Invited oral presentation


• Choice of Court Agreements and Derogation from Competition Law: from a Japanese Perspective

  Kazuaki Nishioka

  Asia-Pacific Colloquium of Journal of Private International Law (Kyoto), Japan, Dec. 2018, English

  Oral presentation


• ニューヨーク条約と競争請求

  西岡和晃

  国際法学会, Sep. 2018, Japanese

  Oral presentation


• 外国で締結された国際カルテルへの独禁法の適用を肯定した事例

  西岡和晃

  渉外判例研究会, May 2018, Japanese

  Oral presentation


• Competition Law and Private International Law

  Kazuaki Nishioka

  Guest lecture, the University of Hong Kong, Hong Kong, Feb. 2018, English

  [Invited]

  Public discourse


• 競争請求と管轄合意

  西岡和晃

  国際商取引学会, Nov. 2017, Japanese

  Oral presentation


• Competition Law and Private International Law

  Kazuaki Nishioka

  Guest lecture, the University of Hong Kong, Hong Kong, Mar. 2017, English

  [Invited]

  Public discourse


• Cross-Border Legal Considerations in Competition Law

  Kazuaki Nishioka

  Guest Lecture, De La Salle University, Manila, the Philippines, Jan. 2017, English

  [Invited]

  Public discourse


• 米国における反トラスト法をめぐる抵触法上の問題

  西岡和晃

  国際商取引学会, Nov. 2016, Japanese

  Oral presentation


• Anti-competitive Conduct and Private Law Remedies: Some Cross-border Considerations

  Kazuaki Nishioka

  Young Scholars Lunchtime Talks Series, Centre for Comparative and Public Law at the Faculty of Law, The University of Hong Kong, Mar. 2016, English

  [Invited]

  Public discourse


• 競争請求に関する外国判決の承認および執行

  西岡和晃

  日本国際経済法学会, Nov. 2015, Japanese

  Oral presentation


• 競争制限行為の準拠法－EUおよびスイスにおける議論からの示唆－

  西岡和晃

  国際私法学会, Jun. 2015, Japanese

  Oral presentation

• 日本国際経済法学会


• 国際商取引学会


• 国際法学会


• 国際私法学会

• The Current State and Future Outlook of International Commercial Arbitration: Expanding Arbitrability and Responding to Global Challenges

  Nishioka Kazuaki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2026 - Mar. 2031


• Cross-Border Litigation in Competition Law: The Impact of Choice of Forum Clauses and Arbitration Agreements

  Kazuaki Nishioka

  スイス政府, Swiss Government Excellence Scholarship (Post-doctorate), チューリヒ大学, Sep. 2018 - Aug. 2019, Principal investigator


• 国際仲裁における競争請求をめぐる国際私法上の諸問題

  西岡 和晃

  日本学術振興会, 科学研究費助成事業 研究活動スタート支援, 研究活動スタート支援, 同志社大学, 25 Aug. 2017 - 31 Mar. 2019

  本研究は、国際仲裁における競争請求をめぐる法的状況を明らかとすることを目的とするものである。本年度は、①国際仲裁と競争請求に関する文献の収集・現地調査、②研究成果のとりまとめ・公表を行った。 ①国際仲裁と競争請求に関する文献の収集・現地調査：前年度からの継続事項として、国際仲裁と競争請求に関する文献を収集すると同時に、シンガポールおよびミャンマーの研究者・実務家に対するインタビューを実施し、各国における最新の動向についても調査を行った。実地調査の結果、ミャンマーでは、競争請求そのものがほとんど認識されていないこともあり、国際仲裁との関係についてほとんど議論がないこと等、シンガポールでは、競争請求自体は認識されているものの、国際仲裁との関係ではあまり議論がないこと等が判明した。 ②研究成果のとりまとめ・公表：競争請求の仲裁可能性と競争請求に関する仲裁判断の執行可能性の問題については、一定の成果を見ることができたため、研究成果を研究会および学会において報告したほか（第6回北陸国際関係私法研究会、国際法学会2018年度（第121年次）研究大会）、当該研究報告に基づく論文を学会誌（国際法外交雑誌）において公表する予定である。また、競争請求の準拠法との関係では、競争法の国際的適用範囲が問題となることから、日本の独占禁止法の国際的適用範囲についても研究報告（2018年5月度渉外判例研究会）を行うとともに、研究成果を公表した（「外国で締結された国際カルテルへの独禁法の適用を肯定した事例－最三小判平成29・12・12」ジュリスト 1526号142-145頁）。その他の問題については、2019年内に研究成果を公表する予定である。