According to the prefecture's authorities, a poultry farm confirmed finding several dead birds on Friday. Genetic analysis showed the presence of the highly pathogenic Н5 strain.
There are now restrictions in place on transporting chickens and eggs within a three-kilometre (1.8-mile) area surrounding the farm as well as on exporting chickens and eggs outside of a 10-kilometre (6.2-mile) radius.
Aomori is the eighth Japanese prefecture to confirm a bird flu outbreak this season.
The avian influenza outbreak in the fall of 2020 to the spring of 2021 was the largest in Japan's history. The virus affected more than a third of prefectures, about 10 million chickens were culled in more than 50 farms.