Japan advertising rules in 2026
Since 1 October 2023 Japan has treated undisclosed advertising, known as stealth marketing, as a misleading representation under the Act against Unjustifiable Premiums and Misleading Representations. Any content a business directs or controls must be recognisable as advertising, with labels such as “広告”, “PR” or “プロモーション”. The Consumer Affairs Agency issued its first order in June 2024 against a clinic that gave patients a discount for positive Google Maps reviews. For media plans, LINE Yahoo’s LY Ads remains the main domestic alternative to Google for search and display.
Executive findings
- 1
From 1 October 2023, representations by a business that consumers find hard to recognise as the business’s own are prohibited as stealth marketing under the Premiums and Representations Act.
Secondary source. Scope: Japan; law firm analysis of the Consumer Affairs Agency notice, as of . [1]
- 2
On 7 June 2024 the Consumer Affairs Agency issued its first stealth marketing order, against a medical corporation that offered a 550 yen discount for favourable Google Maps reviews.
Secondary source. Scope: Japan; law firm alert, as of . [2]
- 3
Failure to comply with an order can be punished by up to two years’ imprisonment or a fine of up to three million yen.
Secondary source. Scope: Japan; law firm alert, as of . [2]
- 4
The Consumer Affairs Agency’s 2024 White Paper discusses stealth marketing as disguised advertising that weakens consumers’ decision-making.
Documented: official source. Scope: Japan; Consumer Affairs Agency, as of . [3]
Method and limitations
- Question
- What changed in advertising rules and platform options in Japan during 2025 and 2026, and what should an advertiser do about it?
- Written for
- Marketing leads and founders planning paid media in Japan.
- Decision at stake
- Which compliance steps to complete before launch, and which channels deserve a test budget this year.
- Sources
- Law firm analyses from DLA Piper and Baker McKenzie, the Consumer Affairs Agency 2024 White Paper summary and LINE Yahoo’s LY Ads page.
- Period
- Official and professional sources as published on 18 October 2026.
- Markets
- Japan, national rules and the platform policies that apply there
- Definitions
- Stealth marketing: advertising that hides the fact that a business created, paid for or directed the content.
- Limitations
- This briefing is not legal or tax advice. Confirm obligations with qualified local counsel before acting.
- Rules and platform terms change; each source shows the date we read it.
What counts as stealth marketing
Secondary source
The rule targets content that looks like an independent third party’s opinion but was in fact determined or directed by the business. It applies to all media, including television, print and the internet. A creator post the brand paid for, a review written in return for a benefit, or an employee posting as an ordinary customer can all fall inside it.
The safe course is a clear advertising label at the start of the content and a contract that tells the creator where and how to place it.
Enforcement so far
Secondary source
The first order in 2024 concerned reviews rather than influencers, which shows that review incentives are as risky as paid posts. Orders are public, so the reputational cost usually exceeds the legal one.
Opportunities this year
Documented: official source
LY Ads covers search and display across Yahoo! JAPAN and LINE, and sits next to Google in most Japanese search plans. Brands that build a compliant creator programme can still use social video at scale on YouTube, TikTok and Instagram. FOCUSADS includes LY Ads in Japanese plans where the goal fits, and keeps creator labelling in the approval checklist.
How this connects to our method: How market rules enter the plan
References
- Consumer protection in Japan: new law prohibits stealth marketing, DLA Piper, accessed
- Japan: Consumer Affairs Agency issues its first stealth marketing-related Order for Action, Baker McKenzie (Lexology), accessed
- White Paper on Consumer Affairs 2024 (summary), Consumer Affairs Agency, Japan, accessed
- LINEヤフー広告 (LY Ads: search and display), LINE Yahoo for Business, accessed