Criteria Changes to Acquisition of Japanese Nationality
The Nationality Act has been amended so that from January 1, 2009 a person whose paternity has been acknowledged by his/her father who is a Japanese national is able to acquire, by filing a notification, Japanese nationality even if his/her parents are not married to each other.
Those who were not able to acquire nationality before this amendment due to their parents' unmarried status can acquire Japanese nationality by filing a notification by December 31, 2011.
Further details, please contact the consular section.
Leaflet Criteria Changes to Acquisition of Japanese Nationality