noun
notification of separation from family register; notification of creation of a new family register
A formal document submitted to a municipal office to remove oneself from the current family register and establish a separate one. Used in Japanese family registration (koseki) procedures.
結婚を機に、分籍届を提出して新しい戸籍を作った。
Upon marriage, I submitted a notification of separation from the family register and created a new family register.
分籍届は市区町村の役所で受け付けています。
Notifications of separation from the family register are accepted at municipal offices.
転籍届 is a notification for moving the entire family register to another location, whereas 分籍届 is for an individual to leave the existing register and create a new one.
Compound of 分籍 (ぶんせき, 'separation from a family register') and 届 (とどけ, 'notification, report').