Carrying a knife in Japan: the 6 cm rule and what counts as a legitimate reason
NPS lists a knife among the Ten Essentials. In Japan, though, carrying one is tightly regulated, and visitors are often surprised. This is a plain-language summary of what Japanese police publish, not legal advice. There is no official English translation of the main law; the government's translation site lists it as untranslated.
The two laws
| Law | What it covers | Penalty |
|---|---|---|
| Firearms and Swords Control Act, Article 22 | No one may carry a blade longer than 6 cm except for work or another legitimate reason. A narrow exception covers some scissors and folding knives up to 8 cm of designated types | Up to 2 years' imprisonment or a fine of up to 300,000 yen (Tokyo police) |
| Minor Offenses Act, Article 1(2) | Concealed carrying of a knife or other dangerous implement without a legitimate reason, regardless of blade length | Detention or a petty fine |
The 8 cm exception is narrower than it sounds. Kagoshima police describe it as covering folding knives and scissors whose tip isn't especially sharp and whose edge isn't keen, and they stress that even blades under 6 cm can be regulated.
What counts as a legitimate reason
- Tokyo police give the example of buying a knife at a store and taking it home.
- Kagoshima police name farm work and camping as legitimate purposes, but warn against carrying a knife when you have no plan to use it for such a purpose, and against carrying multi-tools "as an accessory".
- Self-defense is not a legitimate reason (Tokyo police). Tokyo's English manual for foreign residents adds that "I have it to protect myself", "it's convenient" and "it's fashionable" are not reasons either.
- Even stationery such as scissors or box cutters can be targeted if carried ready to use without a reason (Tokyo police).
- Hiding a knife on your person or in a car can count as concealed carrying (Tokyo police).
Our suggestions for campers
- Pack knives with your camping gear, sheathed and stowed in a bag or box, not in a pocket or the car's door pocket.
- Go directly between home and the campsite; don't carry the knife around town on the way.
- For city sightseeing days, leave multi-tools at your lodging.
- Check airline and rail rules separately; this article covers carrying, not transport rules.
Everyday
Keep camp knives packed away with your camping gear, and take them out only at the campsite.
When it counts
If you travel to or within Japan with outdoor gear, you stay on the right side of the law.
Sources and when we checked them
- Tokyo Metropolitan Police Department, about knives (2025-08-14, in Japanese) (checked 2026-10-31)
- Tokyo Metropolitan Police Department, FAQ: is this a knife possession violation? (in Japanese) (checked 2026-10-31)
- Kagoshima Prefectural Police, don't carry knives without a legitimate reason (2025-01-28, in Japanese) (checked 2026-10-31)
- Tokyo Metropolitan Government, Foreign Resident Manual (English, PDF) (checked 2026-10-31)
- e-Gov (Japan), Firearms and Swords Control Act, Article 22 (in Japanese) (checked 2026-10-31)
- Japanese Law Translation, Act for Controlling the Possession of Firearms or Swords and Other Such Weapons (listing) (checked 2026-10-31)
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