①With respect to a person who has a registered domicile within the area of the municipality, the mayor of the municipality must prepare a family register supplement by unit of the family register.

②The mayor of the municipality may, as specified by Cabinet Order, prepare the family register supplement referred to in the preceding paragraph using a magnetic disk.

The following matters are to be entered in a family register supplement (in the case of a family register supplement prepared using a magnetic disk under paragraph (2) of the preceding Article, recorded; the same applies hereinafter):

①In a family register supplement, in addition to the matters prescribed in the preceding Article, for a person registered in the overseas electoral register under Article 30-6, paragraph (1) of the Public Offices Election Act, a person for whom a transfer of registration to the overseas electoral register (meaning a transfer of registration to the overseas electoral register prescribed in Article 30-2, paragraph (3) of that Act; hereinafter the same applies in this Article) has been made under paragraph (2) of that Article, and a person registered in the overseas referendum voter register under Article 37, paragraph (1) of the Act on Procedures for Amendment of the Constitution of Japan (Act No. 51 of 2007), that fact and the name of the municipality where the registration or the transfer of registration to the overseas electoral register was made must be entered.

②When the election administration commission of a municipality has registered a person in the overseas electoral register under Article 30-6, paragraph (1) of the Public Offices Election Act, has made a transfer of registration to the overseas electoral register under paragraph (2) of that Article, or has canceled a person's registration in the overseas electoral register under Article 30-11 of that Act, or has registered a person in the overseas referendum voter register under Article 37, paragraph (1) of the Act on Procedures for Amendment of the Constitution of Japan, or has canceled a person's registration in the overseas referendum voter register under Article 42 of that Act, the commission must, without delay, notify that fact to the mayor of the municipality of the registered domicile of the person for whom the registration or the transfer of registration to the overseas electoral register was made, or whose registration was canceled.

An entry, deletion, or amendment of an entry in a family register supplement (referred to in Article 30-41, paragraph (1) as "entry, etc. in a family register supplement") is to be done ex officio.

①When the mayor of the municipality of address has made an entry, etc. in a certificate of residence, and an amendment of an entry in the family register supplement should be made at the municipality of the registered domicile, the mayor of the municipality of address must, without delay, notify the matters to be amended to the mayor of the municipality of the registered domicile.

②When the matters notified under the preceding paragraph do not match the entry or record in the family register, the mayor of the municipality of the registered domicile must, without delay, notify that fact to the mayor of the municipality of address.

③When the registered domicile has been transferred from one municipality to another, the mayor of the municipality of the former registered domicile must, without delay, notify the matters entered in the family register supplement to the mayor of the municipality of the new registered domicile.

④The notice given under the preceding three paragraphs is to be given by transmission from a computer used by the mayor of the municipality through a telecommunications line to a computer used by the other mayor of the municipality that is the recipient, as specified by Ministry of Internal Affairs and Communications Order (for a notice given under the preceding two paragraphs, a Ministry of Internal Affairs and Communications and Ministry of Justice Order; the same applies below in this paragraph); provided, however, that this does not apply in a case specified by Ministry of Internal Affairs and Communications Order.

If the mayor of the municipality finds it necessary, the mayor may remake the family register supplement.

If the mayor of the municipality of the registered domicile receives a notice under Article 21-2, paragraph (2) of the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures (including as applied mutatis mutandis under Article 26 of the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures) (limited to a notice given where the information provider or the information provider concerned with operations under an ordinance prescribed in Article 19, item (viii) or item (ix) of the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures is the Minister of Justice referred to in Article 9, paragraph (3) of the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures), the mayor is to provide the matters listed in Article 17, item (ii), item (iii), item (v) and item (vi) that are recorded on the family register supplement of the person to whom the notice pertains to the Japan Agency for Local Authority Information Systems (hereinafter referred to as "the Agency"), as specified by Cabinet Order.

①A person recorded on a family register supplement kept by a municipality (including a person removed from that family register supplement (excluding a person for whom the entire entry relating to that person was made in error by the mayor of the municipality and that entry has been deleted); the same applies in the following paragraph), or that person's spouse, lineal ascendant, or lineal descendant, may request the mayor of that municipality to issue a copy of the family register supplement pertaining to those persons (for a municipality that prepares a family register supplement using a magnetic disk under Article 16, paragraph (2), a document stating the matters recorded on that family register supplement; the same applies in the following paragraph, paragraph (3), and Article 46, item (ii)).

②If it is necessary for the performance of affairs specified by laws and regulations, an organ of the State or of a local government may request the mayor of the municipality to issue a copy of the family register supplement pertaining to a person recorded on a family register supplement kept by that municipality, which omits the statement of the matters listed in Article 17, item (vii).

③In addition to what is provided for in the preceding two paragraphs, if a person listed in the following items makes a request stating that, with respect to a family register supplement kept by the municipality, a copy of the family register supplement showing only the matters listed in Article 17, items (ii) through (vi) is necessary, and the mayor of the municipality finds the request to be reasonable, the mayor may issue that copy of the family register supplement to the person making the request.

④In addition to what is provided for in the preceding three paragraphs, if a specified mandated professional prescribed in Article 12-3, paragraph (3) makes a request, on the ground that the client of a case or affairs that the specified mandated professional has been entrusted with falls under a person listed in any item of the preceding paragraph, stating that a copy of the family register supplement prescribed in that paragraph is necessary, with respect to a family register supplement kept by the municipality, and the mayor of the municipality finds the request to be reasonable, the mayor may issue that copy of the family register supplement to that specified mandated professional.