Law / Japan

Important Computers Act, Notification of Specified Important Computers

Act on the Prevention of Damage from Wrongful Acts against Important Computers (重要電子計算機に対する不正な行為による被害の防止に関する法律, Act 42 of 2025) Arts. 4 and 6

In force since .

A sector security regimes rule binding private bodies.

Instrument type
an act of a legislature
Obligation class
Security, Reporting

As of .

What it requires

  • Applies to a specified social infrastructure business operator, meaning an operator designated under Article 50(1) of the Economic Security Promotion Act (Act 43 of 2022) that uses a specified important computer; reached by declaring that you operate an essential service. The Act and its ministerial order apply from .
  • Notify the minister in charge of your designated business of each specified important computer you introduce, stating its product name and manufacturer name and the other matters the ministerial order sets (Article 4(1) of the Act).
  • File the notice on the prescribed form within four months of the day you introduce the computer, unless the ministerial order excepts it (Article 2(1) of the order); a computer you already use on is notified within six months of that day (Supplementary Provisions, Article 4).
  • Notify the minister of a later change to the notified matters, unless the change is minor as the ministerial order defines it (Article 4(3)).
  • Supply the reports or materials the minister asks for to the extent needed to enforce Articles 4 and 5 (Article 9).
  • Comply with a ministerial order to file or correct a notice by a set deadline (Article 6).

These lines are LexLint's reading of the law's text, as of .

If you get it wrong

Criminal exposureYes

Private right of actionNo

Criminal exposure note

Article 83 punishes a person who violates an order under Article 6 with a fine of up to 2,000,000 yen; Article 86 applies the same fine to the company.

Penalty structure

Article 83 sets a fine of up to 2,000,000 yen for violating an order under Article 6.

Rule
Fixed only
As of
Currency
JPY
Fixed cap
2,000,000

Who enforces it

Enforcement body

The minister in charge of the specified social infrastructure business, who may order an operator to file or correct a notice by a set deadline.

Settledness

As of
Open questions
Is a given customer a specified social infrastructure business operator, a status that depends on an individual designation under the Economic Security Promotion Act and cannot be read from the Act alone?

What this law does

Drafted with AI

Drafted with AI from the cited sources under the direction of UnGovr staff. UnGovr holds editorial responsibility for this page. How this site is made

Research summary

Legal information, not legal advice. This is LexLint's own research summary of a public legal source, and it creates no attorney-client relationship. For decisions that matter, consult qualified counsel in the relevant jurisdiction. About LexLint

Article 4(1) of the Act requires a specified social infrastructure business operator that introduces a specified important computer to notify the minister in charge of its business of the computer, with its product name and manufacturer name and the other matters a ministerial order sets. The ministerial order requires that notice to be filed on the prescribed form within four months of the day the specified important computer was introduced.

A specified social infrastructure business operator is a designated social infrastructure business operator that uses a specified important computer. An operator already using a specified important computer when the Act takes effect must give the Article 4(1) notice within six months of that day. Article 6 of the Act lets the minister in charge order an operator that violates Article 4(1) or (3) to file the notice by a set deadline.

Violating an order under Article 6 is punishable by a fine of up to 2,000,000 yen. The ministerial order, and so the Act it implements, applies from .

When LexLint raises it

When your app profile says your app runs an essential service.

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