No, brass knuckles are classified as hochō (凶器) under Japan’s Swords and Firearms Possession Control Law, making their possession, manufacture, or importation illegal without special authorization. Violations can result in up to 15 years imprisonment or fines exceeding ¥5 million. The National Police Agency (NPA) enforces strict surveillance of weapon-related items, including online marketplaces.
Key Regulations for Brass Knuckles in Japan
- Prohibited Possession: Owning brass knuckles constitutes a violation of Article 3 of the Swords and Firearms Possession Control Law, regardless of intent.
- Import Bans: The Customs Act (Article 69-12) explicitly prohibits importing brass knuckles, with seizures coordinated by the Japan Customs.
- 2026 Compliance Shifts: Amendments to the Organized Crime Exclusion Ordinance (2026) expand NPA scrutiny to include preemptive checks on suspicious online sales of prohibited items.
Local prefectural police departments conduct periodic inspections of antique shops and martial arts supply stores to curb unauthorized distribution. Travelers found with brass knuckles face immediate confiscation and potential criminal charges, even if unaware of the prohibition. Legal alternatives, such as approved self-defense tools, require prior consultation with local authorities.