①In addition to the registered domicile, the following particulars must be entered in a family register for each person in the family register:

②The pronunciation referred to in item (ii) of the preceding paragraph must be the generally accepted pronunciation of the characters when used as part of a name.

③The range of the characters and marks that may be used as the kana characters for names is specified by Ministry of Justice Order.

①Names are entered in the following order:

②The names of any children are entered in the order of their birth.

③The name of a person for whom the reason to join a family register happened after the family register was created is entered at the end of the family register.

Entries in a family register are made based on a notification, a report, an application, a request, entrustment, a certified copy of a certificate or logbook, or a judicial decision.

①When a notification of marriage is made, a new family register is created for the husband and wife; provided, however, that this does not apply if the husband and wife take the husband's surname and the husband's name is entered as the head of his family register, or if they take the wife's surname and the wife's name is entered as the head of her family register.

②In the case referred to in the proviso to the preceding paragraph, the wife who takes her husband's surname joins the husband's family register, and the husband who takes his wife's surname joins the wife's family register.

③When a notification of marriage between a Japanese national and a foreign national is made, a new family register is created for the Japanese national; provided, however, that this does not apply if the Japanese national is entered as the head of their family register.

When a person other than the person entered at the head of a family register and their spouse comes to have a child or adopts a child who takes the same surname as them, a new family register is created for that person.

①A child who takes the surname of their parents joins the parents' family register.

②Except for the case referred to in the preceding paragraph, a child who takes the surname of their father joins the father's family register, and a child who takes the surname of their mother joins the mother's family register.

③An adopted child joins the family register of their adoptive parents.

①If a person who has taken a new surname as a result of marriage or adoption reverts to the surname used before the marriage or adoption as a result of divorce, dissolution of an adoptive relationship, or annulment of the marriage or adoption, that person joins the family register which they joined before the marriage or adoption; provided, however, that if their previous family register has already been removed, or when they request the creation of a new family register, a new family register is created.

②The provisions of the preceding paragraph apply mutatis mutandis to cases in which a person reverts to the surname used before marriage pursuant to the provisions of Article 751, paragraph (1) of the Civil Code, and a person reverts to their previous surname pursuant to the provisions of Article 791, paragraph (4) of the relevant Code.

③If a notification has been submitted to the effect that a person will use the surname that they used at the time of their divorce or the annulment of marriage, or at the time of the dissolution of their adoptive relationship or the annulment of their adoption pursuant to the provisions of Article 767, paragraph (2) of the Civil Code (including as applied mutatis mutandis pursuant to Articles 749 and 771 of the relevant Code) or Article 816, paragraph (2) of the relevant Code (including as applied mutatis mutandis pursuant to Article 808, paragraph (2) of the relevant Code), and if there is no family register in which the person has been entered as the head, or if any other person is entered in the family register in which the person who has made the notification has been entered as the head, a new family register is created for the person making the notification.

Notwithstanding the provisions of the preceding two Articles, if a person who is to join another family register pursuant to the provisions of the preceding two Articles has a spouse, a new family register is created for that person and their spouse.

①If a notification has been submitted to the effect that a person is changing their surname pursuant to the provisions of Article 107, paragraph (2) or (3), and any other person has been entered in the family register of the person who has submitted the notification, a new family register is created for the person who has submitted the notification.

②If a notification has been submitted to the effect that a person is changing their surname pursuant to the provisions of Article 107, paragraph (1) as applied mutatis mutandis pursuant to paragraph (4) of the relevant Article, a new family register is created for the party to the event under notification.

①If a notification of adoption has been submitted pursuant to the provisions of Article 68-2, a new family register is first created for the adopted child; provided, however, that this does not apply if the adopted child has been entered in the family register of an adoptive parent.

②The provisions of Article 14, paragraph (3) apply mutatis mutandis to the case referred to in the proviso to the preceding paragraph.

If the adjudication of a change of gender designation has been rendered pursuant to the provisions of Article 3, paragraph (1) of the Act on Special Cases Involving the Handling of Gender for People with Gender Identity Disorder (Act No. 111 of 2003), and any other person has been entered in the family register of the person to whom the adjudication of the change of gender designation applies (that other person includes a person whose name has been removed from the family register), a new family register is created for the person to whom the adjudication of the change of gender designation applies.

①A person who has attained the age of majority may separate from their family register; provided, however, that this does not apply to the person entered as the head of a family register and their spouse.

②When a notification of separation from a family register has been submitted, a new family register is created.

Except for a person who will join the family register of their father or mother, when a new entry should be made for a person for whom there is no entry in a family register, a new family register is created.

The name of a person for whom a new family register will be created or who will join another family register pursuant to the provisions of Articles 16 through 21 is removed from their previous family register. The same applies to a person who has died, a person subject to a declaration of presumed death, or a person who has lost Japanese nationality.

①If the mayor of a municipality finds that any entry in a family register that is impermissible under law or any mistake or omission is in the entries in a family register, they must notify the notifying person or the party to the event under notification to that effect without delay; provided, however, that this does not apply if the details of and reasons for the correction are clear to the mayor of a municipality from the entries in the family register, entries in the notification, or other documents.

②In the case referred to in the proviso of the preceding paragraph, the mayor of a municipality may correct the family register with the permission of the director with jurisdiction.

③Notwithstanding the provisions of the preceding paragraph, the permission referred to in that paragraph is not required for minor revisions to the content of a family register that do not have an impact on the familial relationships of the persons entered in the family register.

④If, in the course of their duty, a court or any other government agency, public prosecutor, or public official has come to know of any entry in a family register that is impermissible under law, or of any mistake or omission in the entries in a family register, they must notify the mayor of a municipality in the locality of the registered domicile of the parties to the event under notification to that effect without delay.