Japan's CAA fines 4 home builders about ¥440M over 'No.1' ad claims built on a flawed survey
On 28 October 2026 Japan's Consumer Affairs Agency issued surcharge orders under the Act against Unjustifiable Premiums and Misleading Representations to four custom-home builders. The 'No.1' rankings in their ads rested on a survey the agency found was not objective. Any shop or business that advertises rankings should treat this as a prompt to check its own evidence.
Key points
- The four firms are Jutaku Joho-kan (¥167.03M), Hajime Kensetsu (¥124.39M), Iida Sangyo (¥36.91M) and Ernest One (¥112.83M); payment is due by 31 May 2027
- The agency found the survey never checked whether respondents had used or knew the services, compared only Iida Group Holdings with nine arbitrarily chosen firms on website impressions, and was not quoted accurately in t
- Surcharges equal 3% of sales in the covered period; the four firms were found not to have verified whether the survey was objective or matched the ad claims, so no exemption applied
Background
Under Japan's surcharge system, a business that makes a misleading 'superior quality' representation must pay 3% of the sales made during the covered period, capped at three years. No surcharge is ordered if it would be under ¥1.5M or if the business neither knew of the problem nor failed to exercise due care. Self-reporting cuts the amount by half, and refund measures can reduce or remove it.
The ads ran in 2022 and 2023 on flyers and company websites and named a research firm next to each 'No.1'. The case shows that naming a survey provider is not enough if the underlying survey is not objective.
What it means for shops
Any shop or SME that advertises 'No.1', 'ranked first' or satisfaction percentages is affected. Even when the survey came from a parent company, group firm or agency, the business running the ad was held responsible for checking the evidence.
What shops should do
- List every 'No.1', 'ranked #1' or 'most popular' claim on your flyers, website and social media, and check who ran the survey, who was asked, what was compared and when
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Summaries are written by Seiichi Studio based on the original releases. Always check the source for the exact details.