Types of Japanese Legislation: A Reference Guide

Japanese law uses a layered system of legislative instruments, each with a distinct name, issuing authority, and scope. This reference guide defines each type, gives its Japanese term and common romanisation, and notes how it differs from instruments at adjacent levels.

Acts (法律, Hōritsu)

Acts are the primary form of Japanese legislation and the instrument closest in concept to a "law" or "statute" in other jurisdictions. An Act is passed by the National Diet — Japan's legislature — through a majority vote in both the House of Representatives and the House of Councillors, and takes effect on promulgation by the Emperor or on the date specified in the Act itself.

Acts establish the substantive legal framework: they define rights and duties, create regulatory bodies, set penalties, and delegate authority to subordinate instruments. No administrative body can issue rules that contradict or exceed what Acts permit. When an Act specifies that details are to be "prescribed by Cabinet Order" or "set by Ministerial Ordinance," that delegation is a signal that the rule is incomplete without those subordinate instruments.

Acts are identified by a year and number: for example, "Act No. 86 of 2005" refers to the Companies Act.

Cabinet Orders (政令, Seirei)

Cabinet Orders are issued by the Cabinet and rank immediately below Acts. The vast majority are "delegated" Cabinet Orders made under authority expressly granted by an Act. A delegated Cabinet Order cannot expand beyond the scope of that delegation, nor can it contradict the parent Act.

The most common subtype encountered in legal practice is the Enforcement Order (施行令, shikō-rei): a Cabinet Order that provides the detailed rules needed to implement a specific Act. Nearly every major Act has an Enforcement Order. The pattern of reading an Act alongside its Enforcement Order — and then the Enforcement Regulations — is fundamental to working with Japanese law.

Imperial Ordinances (勅令, Chokurei) — Historical

Imperial Ordinances were instruments issued by Imperial authority before Japan's current constitution came into force in 1947. They have no modern equivalent. Some pre-war Imperial Ordinances remain in effect as transitional law, but no new ones can be issued. Where the term appears today, it refers exclusively to these historical documents.

Cabinet Office Ordinances (府令, Furei)

Cabinet Office Ordinances occupy the same tier as Ministerial Ordinances but are issued by the Cabinet Office (内閣府) rather than a line ministry. They typically govern matters within the Cabinet Office's jurisdiction or areas that cut across multiple ministries. The practical effect and status of a Cabinet Office Ordinance is equivalent to a Ministerial Ordinance.

Ministerial Ordinances (省令, Shōrei)

Ministerial Ordinances are issued by individual ministers under authority delegated by an Act or Cabinet Order. They handle the most technical and detailed aspects of a regulatory framework: prescribed forms, numerical thresholds, procedural rules, and technical standards. The corresponding minister's title typically appears in the ordinance name — for example, an ordinance issued by the Minister of Finance is a Ministry of Finance Ordinance (財務省令).

The most common subtype is the Enforcement Regulations (施行規則, shikō-kisoku): a Ministerial Ordinance tied to a specific Act and its Enforcement Order. Together, an Act, its Enforcement Order, and its Enforcement Regulations form the three-level cluster that governs most regulated areas in Japan.

Rules (規則, Kisoku)

The term "rules" covers several distinct types of subordinate legislation issued by bodies with independent rule-making authority granted directly by the Constitution or by statute.

Each set of rules has authority only within the body's designated domain.

Municipal Ordinances (条例, Jōrei)

Municipal Ordinances are enacted by prefectural or municipal assemblies. They may address any matter within the assembly's jurisdiction — land use, environmental standards, consumer protection, local taxation — provided they do not contradict national legislation. In practice, municipalities often set stricter standards than national rules on matters like environmental emissions or business hours.

Public Notices (告示, Kokuji)

Public Notices are official announcements issued by ministries, agencies, or local authorities. They do not have the same rule-making character as Ministerial Ordinances but often serve as the vehicle for designating specific items or values that must change frequently: price indices, approved substances, designated facilities, and similar technical lists. Whether a particular public notice has binding legal effect depends on whether the Act or Ministerial Ordinance under which it is issued gives it that character.

Administrative Circulars (通達, Tsūtatsu)

Administrative Circulars are internal instructions issued by a superior administrative body to its subordinate agencies, directing how to interpret or apply a statute. They are not legislation — they do not appear in the national legislation database and are not legally binding on private parties or courts.

Their practical importance is nonetheless significant. Because administrative agencies generally apply statutes in line with the relevant circular, a circular effectively shapes how a law operates on the ground. Tax circulars (通達) issued by the National Tax Agency, for example, set out the tax authority's interpretation of ambiguous provisions, and businesses plan their affairs accordingly. Circulars are found on individual ministry websites and through official disclosure requests.

How to Read a Japanese Law Citation

Japanese legislative instruments are identified by era, year, type, and number. The era codes commonly encountered are:

A citation such as "平成17年法律第86号" means "Act No. 86 of Heisei 17" — i.e., the 86th Act enacted in 2005. The type indicator (法律 for Act, 政令 for Cabinet Order, 省令 for Ministerial Ordinance) appears between the year and the number.

On elaws.jp and e-Gov, law IDs encode this information: for example, 417AC0000000086 encodes Heisei (4), year 17, Act (AC), number 86.