Roof Rat Laws › Japan
Summary. In Japan, keeping and hobby-breeding a captive-bred roof rat is legal and unregulated federally: the species is deliberately NOT a ‘Specified Animal’ (特定動物, hazardous) and NOT a ‘Designated Invasive Alien Species’ (特定外来生物), a 2005 expert committee chose to exclude it because it’s too long-established to regulate. Commercial activity (breeding for profit, retail sale, exhibition, or large-scale free rehoming) triggers registration as a First-Class (or Second-Class) Animal Handling Business with facility/welfare standards. The big restriction is IMPORT: bringing a roof rat into Japan is de-facto prohibited for the public, the Ministry of Health requires imported rodents to have lived since birth in a foreign-government-designated biosecure facility (homes/hobby breeders don’t qualify). Never release one.
legal note
This is a research aid, not legal advice; rules change and are interpreted by local officials. Verify with the official source before acting.Status by activity
Keeping / owning Legal
Confidence: High · Last verified 2026-06-07
Private possession needs no federal permit: R. rattus is not a ‘Specified Animal’ (特定動物, that list targets primates, big carnivores, large/venomous reptiles, not rodents), and it is not a ‘Designated Invasive Alien Species’ (特定外来生物). The 2005 Ministry of the Environment expert committee deliberately excluded it (long-established via maritime trade; eradication-vs-pet distinction). Domestic keeping is treated like keeping a fancy rat or guinea pig.
Sources: Japan Ministry of the Environment (MOE), Japan Ministry of the Environment (MOE), Japan Ministry of the Environment (MOE)
Breeding Legal
Confidence: High · Last verified 2026-06-07
Private breeding without intent to profit/advertise/distribute commercially is entirely outside the commercial animal-handling law. (Commercial-scale breeding triggers First-Class Animal Handling Business registration, see sell_give.)
Selling or giving away Legal with a permit
Confidence: High · Last verified 2026-06-07
Selling for profit (or breeding to sell) requires registration as a First-Class Animal Handling Business (第一種動物取扱業) with the prefecture, plus facility/caging/disclosure standards and an Animal Handling Manager. Giving animals away free to ‘a large number of unspecified people’ on a continuing basis requires Second-Class (第二種) notification. Occasional free rehoming to friends/family is unregulated.
Sources: Japan Ministry of the Environment (MOE), Japan Ministry of the Environment (MOE)
Transport & import Restricted
Confidence: High · Last verified 2026-06-07
DOMESTIC transport between prefectures is unregulated (subject only to carrier policies). IMPORT is de-facto prohibited for pets: under the Infectious Diseases Control Law’s Animal Import Notification System, all live rodents need a health certificate from the EXPORTING government certifying the animal lived since birth in a government-designated disease-free facility, which homes and hobby breeders cannot obtain, so a pet roof rat cannot legally be imported. (R. rattus is not on the absolute-prohibition list, but the facility rule is an effective ban.) Export from Japan is legal with the destination country’s health certificate (MAFF AQS). Never release.
Sources: Japan Ministry of Health, Labour and Welfare (MHLW), Japan Ministry of Health, Labour and Welfare (MHLW)
Restrictions & responsibilities
- Register as a First-Class Animal Handling Business before any commercial sale/breeding
- Or file a Second-Class notification for large-scale free rehoming
Where: Prefectural government (animal welfare center / public health dept)
Source: Japan Ministry of the Environment (MOE), Japan Ministry of the Environment (MOE)
Where: Ministry of Health, Labour and Welfare (quarantine station at port of entry)
Source: Japan Ministry of Health, Labour and Welfare (MHLW), Japan Ministry of Health, Labour and Welfare (MHLW)
Official sources
- Designated Invasive Alien Species list, Ministry of the Environment (R. rattus NOT listed), Japan Ministry of the Environment (MOE)
- List of Specified Animals (特定動物), rodents excluded, Japan Ministry of the Environment (MOE)
- MOE Expert Group minutes (July 2005), rationale for excluding R. rattus (established; Watase/Blakiston lines), Japan Ministry of the Environment (MOE)
- Regulation of Animal Handling Business (動物取扱業の規制), First-Class registration scope, Japan Ministry of the Environment (MOE)
- Second-Class Animal Handling Business (第二種動物取扱業), non-commercial large-scale transfer, Japan Ministry of the Environment (MOE)
- Animal Import Notification System for rodents (designated-facility health certificate), MHLW, Japan Ministry of Health, Labour and Welfare (MHLW)
- MHLW public warning, pet rodents ‘basically cannot be brought into Japan’, Japan Ministry of Health, Labour and Welfare (MHLW)
Search terms: Rattus rattus, クマネズミ (kumanezumi), roof rat, black rat, ship rat.
Last reviewed 2026-06-07, which is when a person last read this page against its sources. Spotted an error, or know the law has changed? Email blonderoofrat@gmail.com. And if you write to the agency yourself and get an answer in writing, please forward it. Written agency replies are how 31 of these pages stopped being research and became confirmed.