Law / Japan

Important Computers Act, Report of Specified Infringement Events

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), Art. 5

In force since .

A vulnerability and incident reporting rule binding private bodies.

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

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 .
  • On becoming aware of a specified infringement event on a specified important computer, or of an event the ministerial order names as a possible cause of one, report it to the minister in charge of your business and to the Prime Minister (Article 5 of the Act).
  • File a first report promptly after becoming aware of the event, stating what you know at that time, and file a full report within 30 days of the day you became aware of it (Article 4(2) of the order).
  • Include in each report the matters the order lists: the report category, an outline of the operator, an outline of the event, the computer affected, technical matters, the response taken and other notes (Article 4(3) of the order).
  • Events within six months of your designation, or of a computer becoming a specified important computer, are outside the duty (Article 4(2)(1) and (2) of the order).
  • Comply with a ministerial order to make or correct a report by a set deadline (Article 6 of the Act).

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 make or correct a report by a set deadline.

Settledness

As of
Open questions
How soon after becoming aware must the first report be made, given that the ministerial order says only promptly and states no hour count?

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 5 of the Act requires a specified social infrastructure business operator that becomes aware of a specified infringement event on a specified important computer, or of an event the ministerial order names as a possible cause of one, to report it to the minister in charge of its business and to the Prime Minister. The ministerial order requires the operator to file a first report promptly after becoming aware of the event and a full report within 30 days of becoming aware of it.

A specified social infrastructure business operator is a designated social infrastructure business operator that uses a specified important computer. Article 6 of the Act lets the minister in charge order an operator that violates Article 5 to make the report or correct its content 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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