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Japanese Law Numbers - HTML
Japanese law numbers are a numbering system assigned at the time of promulgation to identify laws, cabinet orders, imperial orders, ministerial ordinances, and rules. Numbers are assigned sequentially from No. 1 for each calendar year according to the type of law and year of enactment, and when the era name changes, numbering starts anew from No. 1 at that point. Assigned based on the promulgation date, they play an important role in uniquely identifying laws, especially when multiple laws share the same title. In the e-Gov law search system, a 15-digit law ID is used to identify laws in a machine-readable format.
law
act
cabinet order
ministerial ordinance
e-Gov
law number
legal system
official gazette
<table>
<thead><tr><th>code</th><th>slug</th><th>name</th><th>description</th><th>format</th><th>lawType</th><th>lawIdPrefix</th></tr></thead>
<tbody><tr><td>1</td><td>constitution</td><td>Constitution</td><td>The supreme law of Japan.</td><td>Constitution of Japan (no law number)</td><td>Constitution</td><td></td></tr>
<tr><td>2</td><td>act</td><td>Act</td><td>Laws established through approval by the National Diet based on constitutional provisions.</td><td>Era Name Year Act No. X (e.g., Heisei 5 Act No. 88)</td><td>Act</td><td>AC</td></tr>
<tr><td>3</td><td>cabinet-order</td><td>Cabinet Order</td><td>Orders issued by the Cabinet to implement constitutional and legal provisions.</td><td>Era Name Year Cabinet Order No. X (e.g., Showa 60 Cabinet Order No. 75)</td><td>CabinetOrder</td><td>CO</td></tr>
<tr><td>4</td><td>imperial-order</td><td>Imperial Order</td><td>An old form of law, but includes those still valid at the time data compilation began.</td><td>Era Name Year Imperial Order No. X (e.g., Showa 18 Imperial Order No. 618)</td><td>ImperialOrder</td><td>IO</td></tr>
<tr><td>5</td><td>ministerial-ordinance</td><td>Ministerial Ordinance</td><td>Orders established by heads of organizations based on laws and cabinet orders.</td><td>Era Name Year Ministry Ordinance No. X (e.g., Heisei 17 Ministry of Justice Ordinance No. 27)</td><td>MinisterialOrdinance</td><td>M1-M6</td></tr>
<tr><td>6</td><td>rule</td><td>Rule</td><td>Rules such as National Personnel Authority rules, Board of Audit rules, and Supreme Court rules.</td><td>Era Name Year Rule No. X (e.g., Showa 22 Board of Audit Rule No. 1)</td><td>Rule</td><td>R</td></tr></tbody>
</table>