RIKEN: Overview, Centers, and Fellowship Programs

What it is and who runs it

RIKEN (理化学研究所, Rikagaku Kenkyūjo), historically translated as the Institute of Physical and Chemical Research, is Japan’s largest comprehensive natural sciences research institute. Founded in 1917, RIKEN operates as a Designated National Research and Development Institute (特定国立研究開発法人) under Japan’s Ministry of Education, Culture, Sports, Science and Technology (MEXT). Under the leadership of President Makoto Gonokami, RIKEN conducts basic and applied research spanning physics, chemistry, biology, medical sciences, engineering, computational science, and artificial intelligence.

RIKEN operates dedicated national laboratories rather than conferring academic degrees. Key research centers and user facilities across Japan include:

Wako Main Campus (Saitama): Houses the Center for Brain Science (CBS), the Nishina Center for Accelerator-Based Science (operating the Radioactive Isotope Beam Factory, which synthesized element 113, Nihonium), and the Center for Sustainable Resource Science.
Kobe Campus (Hyogo): Hosts the Center for Computational Science (R-CCS), which operates the Fugaku supercomputer, alongside the Center for Biosystems Dynamics Research (BDR).
Yokohama Campus (Kanagawa): Focuses on life and medical sciences, including the Center for Integrative Medical Sciences (IMS).
Harima Campus (Hyogo): Operates synchrotron and photon infrastructure, including the SPring-8 synchrotron and SACLA X-ray free-electron laser.
Tokyo Nihonbashi: Centers foundational machine learning and AI at the Center for Advanced Intelligence Project (AIP).

Eligibility (summary, with the official source)

As described on the official RIKEN programs portal on November 9, 2026, researchers join RIKEN through three primary competitive junior researcher mechanisms:

Special Postdoctoral Researchers Program (SPDR): Open to researchers of all nationalities holding a PhD awarded within five years of the appointment start date (for FY 2027, awarded on or after January 1, 2021) or expected prior to hire. Lapses due to maternity leave, childcare leave, or private-industry non-research work can extend this window. Former SPDR and FPR fellows are ineligible.
International Program Associate (IPA): Open to non-Japanese doctoral students enrolled in partner universities (in Japan or abroad) that maintain joint graduate school agreements with RIKEN. Students carry out dissertation experiments at RIKEN toward a degree awarded by their home university.
Junior Research Associate (JRA): Open to doctoral students enrolled in Japanese graduate schools with institutional collaborative agreements with RIKEN. Applicants must be within the standard degree duration.

Across all tracks, candidates must secure preliminary agreement from a RIKEN Laboratory Head (Host PI) before submitting an application.

What it funds or requires

Fellowship terms and funding at RIKEN provide competitive compensation and dedicated operating support:

SPDR Remuneration and Research Budget: SPDR fellows receive a fixed-term, three-year contract with a monthly salary of ¥550,000 (tax and social insurance included). Benefits include a commuting allowance (up to ¥150,000 per month), a housing allowance subsidizing rent, and relocation travel support. SPDRs receive an annual discretionary research funding allocation of ¥1,000,000, with an additional competitive allocation of up to ¥1,000,000 available up to twice during the term upon review.
External Grant Eligibility: SPDR fellows are eligible to apply for external Japanese funding, including MEXT and JSPS Grant-in-Aid for Scientific Research (KAKENHI) Early-Career Scientist awards.
Working Conditions: SPDR fellows work under the specialized duties discretionary work system (7 hours 30 minutes/day) with access to telecommuting, 20 days annual paid leave, and contract extensions for parental leave.
IPA Support: IPAs receive a daily living allowance and furnished accommodation or housing subsidies for up to three years while conducting dissertation research.
JRA Remuneration: JRAs work part-time (25 hours per week: 5 hours daily) with a monthly salary of ¥250,000 (tax inclusive) and commuting allowances up to ¥150,000/month. Contracts are annual and renewable up to three consecutive years (four years for four-year doctoral programs).

Application or compliance steps

Securing an appointment at RIKEN involves six distinct administrative and scientific steps:

Host Laboratory Consultation: Review the official list of laboratories with approved openings and contact the Laboratory Head with your CV and a preliminary research outline to obtain hosting endorsement.
Proposal Drafting: In alignment with the host lab, draft an independent research proposal. For the SPDR, this must not exceed five A4 pages, covering objectives, methodology, and annual milestones.
Dossier Assembly: Complete standard application forms: an official CV, a Summary of Research Achievements (strictly capped at one A4 page), a Publication and Presentation List, and reference letters.
Online Portal Submission: Register and upload all materials via the official RIKEN application portal within the open call window. Dossiers and interviews may be completed in English or Japanese.
Two-Stage Screening: Applications undergo document review by discipline-specific panels (mathematics, physics, chemistry, biology, medicine, engineering), followed by an oral interview defense for shortlisted candidates.
Institutional Compliance Clearances: Final appointments require clearance under Japan’s Foreign Exchange and Foreign Trade Act (FEFTA) export control regulations, research integrity disclosures, and bioethics or animal care board approvals where applicable.

Typical timeline phases (no calendar dates as facts)

Application cycles follow annual seasonal milestones aligned with the Japanese fiscal year (April 1 to March 31):

Phase 1: Laboratory Matching (Late Winter to Early Spring): The annual list of participating laboratories is released; applicants consult prospective host PIs to secure agreement.
Phase 2: Formal Call and Submission (Spring): The online application portal opens and closes for registration, dossier uploads, and reference letters.
Phase 3: First-Round Document Screening (Late Spring to Early Summer): Specialized internal and external committees review applicant records and research plans.
Phase 4: Second-Round Interview Defense (Mid-Summer): Shortlisted finalists present their project plans before the review panel in person or via video conference.
Phase 5: Award Notification and Visa Processing (Early Autumn): Selection results are published; international awardees begin Certificate of Eligibility and Japanese visa procedures.
Phase 6: Appointment Commencement (Fiscal Year Start): New fellows formally start their contracts on April 1, with alternative start dates arranged upon request.

Common mistakes

Applicants to RIKEN programs should avoid these frequent procedural pitfalls:

Applying Without Host PI Endorsement: Submitting an application without prior consultation and written agreement from the Laboratory Head results in immediate rejection.
Exceeding Strict Page Limits: Submitting more than one A4 page for the research achievements summary or more than five A4 pages for the project proposal violates formatting guidelines and risks disqualification.
Violating Dual-Funding Restrictions: Holding concurrent awards that forbid outside compensation (such as a JSPS DC research fellowship) prevents appointment as a JRA.
Assuming Degree-Granting Status: Applying to RIKEN expecting a diploma directly from the institute; all doctoral students must maintain active enrollment in an accredited partner university.
Overlooking Export Control Clearances: Failing to disclose prior foreign institutional affiliations or dual-use technological applications required under FEFTA screening protocols.

Related programs (table)

The table below compares RIKEN junior scientist positions with primary Japanese and international research fellowships:

Program	Target Career Stage	Appointment Duration	Monthly Compensation	Annual Research Budget	Primary Requirement
RIKEN SPDR	Postdoctoral (within 5 years of PhD)	3 years	¥550,000 salary	¥1,000,000 (discretionary)	Full-time research at RIKEN; host PI endorsement.
JSPS Postdoctoral Fellowship (Standard)	Postdoctoral (within 6 years of PhD)	12 to 24 months	¥362,000 stipend	Up to ¥1,500,000 (via Grant-in-Aid)	Administered by JSPS; hosted at Japanese universities or institutes.
RIKEN IPA	Doctoral (partner universities)	Up to 3 years	Daily allowance (~¥5,200/day) + housing	Covered by host laboratory	Enrolled at partner university; non-Japanese nationality.
RIKEN JRA	Doctoral (Japanese universities)	1 year (renewable to 3–4 years)	¥250,000 salary (part-time)	Covered by host laboratory	Enrolled in Japanese university PhD course; no concurrent JSPS DC fellowship.
MSCA Postdoctoral Fellowship	Postdoctoral (within 8 years of PhD)	12 to 36 months	Living allowance (~€5,080/mo gross)	Institutional training allowance	European mobility rule; hosted at European institutions.

FAQ

What is RIKEN?

RIKEN is Japan’s premier comprehensive national research and development institute, operating under MEXT. It conducts fundamental and applied scientific research across physics, chemistry, biosciences, medical science, engineering, and high-performance computing.

What does the name RIKEN mean?

The name RIKEN is a contraction of its Japanese legal name, Rikagaku Kenkyūjo (理化学研究所), meaning the Institute of Physical and Chemical Research. Founded in 1917, the institute maintains RIKEN as its global identity.

What is the RIKEN postdoc program?

The primary RIKEN postdoc program is the Special Postdoctoral Researchers Program (SPDR). It offers competitive three-year appointments with a monthly salary of ¥550,000, housing and commuting benefits, and an annual discretionary research budget of ¥1,000,000 for early-career scientists within five years of their PhD.

How does a doctoral student conduct PhD research at RIKEN?

Doctoral candidates conduct PhD research at RIKEN through the International Program Associate (IPA) program for students from international partner universities, or the Junior Research Associate (JRA) program for students enrolled in Japanese universities. Students complete laboratory research under RIKEN scientists while receiving their degree from their home university.

Are international researchers eligible for RIKEN postdoctoral fellowships?

Yes. The SPDR program welcomes applications from all nationalities without geographic quotas. Application documents, research plans, and selection interviews may be conducted entirely in English, and international appointees receive visa and relocation support.

Can RIKEN postdoctoral researchers apply for Japanese KAKENHI grants?

Yes. As official fixed-term employees of a Designated National R&D Institute, SPDR fellows are fully eligible to apply for Grant-in-Aid for Scientific Research (KAKENHI) funding from JSPS and MEXT.

Sources

RIKEN Special Postdoctoral Researchers Program (SPDR) Overview: https://www.riken.jp/en/careers/programs/spdr/ (verified November 9, 2026).
RIKEN Call for Applications for Special Postdoctoral Researcher (SPDR) for FY 2027: https://www.riken.jp/en/careers/programs/spdr/career2027/ (verified November 9, 2026).
RIKEN International Program Associate (IPA) Guidelines: https://www.riken.jp/en/careers/programs/ipa/ (verified November 9, 2026).
RIKEN Junior Research Associate (JRA) Program Guidelines: https://www.riken.jp/en/careers/programs/jra/ (verified November 9, 2026).
RIKEN About and Leadership: https://www.riken.jp/en/about/ and https://www.riken.jp/en/about/president/ (verified November 9, 2026).