Citation(s) from the GunPolicy.org literature library
Alleman, Mark. 2000 ‘Japan - Carrying of Permits and Certificates of Registration.’ Firearm and Sword Possession Control Law (Translation); Vol. 9(1) (Art. 24), p. 255. Seattle WA: Pacific Rim Law & Policy Journal Association. 1 February
A person carrying or transporting a firearm or sword shall always carry the permit or Certificate of Registration of said firearm or sword.
2. A police officer, in order to ensure fulfillment of the regulations of the preceding paragraph, can demand presentation of a permit or Certificate of Registration from any person carrying or transporting a firearm or sword.
3. A police officer who demands presentation of a permit or Certificate of Registration under the preceding paragraph must carry and present an identification card showing status [as a police officer].