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Before Choosing an International School — Accreditation, Legal Status, and Costs

By Leon MoriguchiPublished May 15, 2026Updated May 18, 20265 min read日本語版あり
Audience
Parents in Japan considering international school enrollment; parents with overseas university ambitions for their child

TL;DR

  • ·Most international schools in Japan are not "Article 1 schools" under the School Education Act, which has real consequences: Japanese families may have unresolved compulsory-education obligations, and domestic university entrance requires either the Daiken exam or IB Diploma recognition
  • ·CIS, WASC, and IB authorization are the practical quality proxies — a school without any accreditation can inadvertently narrow a child's future pathway options in ways that are hard to reverse after enrollment
  • ·Annual tuition at urban international schools runs ¥1.5–3 million; comparing that figure against the intended educational outcome — specifically whether domestic or overseas university admission is the goal — is more useful than treating cost as a signal of quality

Contents

  1. Lead
  2. What "not being a standard school" means in practice
  3. The main international accreditation systems
  4. IB scores and what they mean for university entry
  5. What the costs actually look like
  6. Putting it into action
  7. Summary
  8. References

Lead

An international school offers an English-medium education — but it is not a "standard school" (ikkō) under Japan's School Education Act. That legal distinction has practical consequences for compulsory education, university entrance eligibility, and the recognition of school-leaving qualifications. Getting acquainted with the institutional landscape before being drawn in by the appeal of an English-language environment reduces the chance of surprises after enrollment.

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