Kazuto Ioka: Japan’s First Four-Division World Champion
Kazuto Ioka: Japan’s First Four-Division World Champion
World titles in four weight divisions and a historic all-Japanese unification. Here is the career of Kazuto Ioka.
Kazuto Ioka made history as the first Japanese boxer to win world titles in four different weight divisions. From mini-flyweight up to super-flyweight, he reigned across the lighter classes for more than a decade, and was part of the first all-Japanese world-title unification bout.
In this guide
1. A four-division champion
2. A historic unification
3. A boxing dynasty
4. Why he matters
1. A four-division champion
A Japanese first.
Ioka won world titles at mini-flyweight, light-flyweight, flyweight and super-flyweight — becoming the first Japanese boxer to be a four-weight world champion, sealed with a 2019 win over Aston Palicte.1
2. A historic unification
An all-Japanese first.
In 2012 he beat Akira Yaegashi in the first world-title unification bout between two Japanese fighters.1
3. A boxing dynasty
A family of champions.
Ioka comes from a boxing family — the “second generation” of a celebrated lineage — and dominated the lighter divisions through the 2010s and into the 2020s.1
4. Why he matters
A master of the lighter weights.
Ioka is one of the defining figures of Japan’s strength in the lower weight classes — see our guide to Japanese world boxing champions.
Frequently asked questions
What is Kazuto Ioka’s biggest achievement?
Becoming the first Japanese boxer to win world titles in four different weight divisions.
Which divisions did he win titles in?
Mini-flyweight, light-flyweight, flyweight and super-flyweight.
What was the 2012 Yaegashi fight?
The first world-title unification bout between two Japanese fighters.
Keep exploring
Explore the stories, systems and culture behind Japanese sport.
Sources & notes
- First Japanese four-weight world champion (mini-flyweight, light-flyweight, flyweight, super-flyweight; sealed vs Palicte 2019); 2012 win over Yaegashi was the first all-Japanese world-title unification. Wikipedia; Japan Times.
A profile dated 22 June 2026. No copyrighted material is reproduced.
📅 更新履歴
| 日付 | 変更内容 |
|---|---|
| 2026年6月22日 | 初回公開 |
✅ ファクト再検証
最終検証日：2026年6月22日
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