Can a Bad Restaurant Review Get You in Legal Trouble in Japan? Where Opinion Ends and Defamation Begins

There is a strange tension around online restaurant reviews.

Saying, “That was delicious” rarely causes trouble.

Say, “That was terrible”, however, and someone may warn you that the restaurant could sue for defamation or accuse you of damaging its business.

Can saying “this restaurant tasted bad” really be illegal?

If you genuinely ate the food and disliked it, are you supposed to keep quiet?

In Japan, the answer is not as simple as either “you can say whatever you want” or “never post a negative review.”

The crucial distinction is often between describing your own experience and making damaging claims of fact that you cannot support.

This article discusses the general position under Japanese law. Defamation and review laws differ between countries, and the result of any real dispute depends heavily on the exact wording, context and evidence.

AI-generated conceptual illustration about online restaurant reviews. It does not depict a specific restaurant, review platform or legal dispute.

“I didn’t like the food” is usually an opinion, not a provable fact

Taste has no universal measuring instrument.

One customer may describe a bowl of ramen as rich and deeply satisfying.

Another may eat exactly the same dish and think it is greasy, salty and unpleasant.

That matters legally.

The Kanagawa Bar Association has discussed a hypothetical case in which a customer gave a restaurant one star and wrote that the food was bad and the service poor.

Its explanation notes that statements such as “it tasted bad” or “the service was poor” are generally subjective impressions rather than assertions of specific facts.

For criminal defamation under Article 230 of Japan’s Penal Code, the law refers to publicly alleging facts that damage another person’s reputation.

So writing:

“I ate there once, and I personally didn’t like the food.”

is fundamentally different from claiming:

“This restaurant serves rotten ingredients.”

The first tells readers how you experienced the meal.

The second tells readers something supposedly factual about how the business operates.

That distinction is one of the most useful things to remember when writing a critical review.

But “it’s only my opinion” is not a magic legal shield

There is an important complication.

The Kanagawa Bar Association also points out that Japanese civil defamation is not limited in exactly the same way as criminal defamation.

Depending on the circumstances, an opinion or criticism that unlawfully damages someone’s social reputation can potentially lead to a civil claim.

Japan’s Civil Code provides a general basis for damages caused by intentional or negligent infringement of another person’s rights or legally protected interests. It also specifically recognizes compensation for non-economic harm, including injury to reputation.

So it would be misleading to turn the rule into:

“Just add ‘in my opinion’ and you can write anything.”

You cannot.

Context matters.

Wording matters.

Whether you actually visited the business matters.

Whether the criticism is directed at the meal or becomes a personal attack matters.

And whether you are presenting an opinion or disguising an unsupported factual accusation as an opinion matters.

The more dangerous territory begins when a review makes factual accusations

Compare these statements:

“The fish tasted old to me.”

and:

“This restaurant knowingly serves rotten fish.”

They may sound similar emotionally, but legally and evidentially they are very different.

The second statement alleges conduct that could, at least in principle, be proved true or false.

The same applies to claims such as:

“They reuse customers’ leftovers.”
“They have caused food poisoning repeatedly.”
“They use ingredients that are past their expiration date.”
“They deliberately cheat customers.”

If you do not actually know those things to be true, publishing them is much riskier than describing what you personally saw, ordered, paid and tasted.

AI-generated conceptual illustration showing the difference between personal opinion and a factual accusation. It does not depict a real restaurant or complaint.

In Japan, “but it was true” is not the entire defamation rule

This point often surprises people outside Japan — and quite a few people inside Japan as well.

Article 230 of the Japanese Penal Code states that publicly alleging facts and damaging another person’s reputation can constitute defamation regardless of whether those facts are true or false.

But that is not the end of the statute.

Article 230-2 provides an important exception where the statement concerns a matter of public interest, is made primarily for the public benefit, and the truth of the alleged facts is proved.

That means the slogan:

“If it’s true, defamation is impossible.”

is too simplistic as a description of Japanese criminal law.

For an ordinary restaurant customer, the practical lesson is much simpler:

Write about what you actually experienced rather than turning a disappointing meal into an investigation of things you cannot personally verify.

A fake review campaign is very different from one unhappy customer

Now consider another situation.

One customer genuinely eats at a restaurant and gives it one star.

That is very different from somebody announcing:

“Everyone give this place one star. Let’s destroy its rating.”

Especially if the participants have never visited the restaurant.

Article 233 of Japan’s Penal Code addresses damage to credibility and obstruction of business through the spreading of false rumors or the use of fraudulent means.

That does not mean every harsh review automatically becomes “obstruction of business.”

But fabricated reviews, fake customer accounts and coordinated deceptive attacks move far away from the basic purpose of a review system.

A review exists to communicate an experience.

It is not supposed to manufacture an experience that never happened.

Personal abuse is not the same thing as reviewing the restaurant

There is another easy line to cross.

Suppose your actual complaint is that the noodles were too salty.

You can explain that.

There is very little consumer value in turning the review into:

“The owner is an idiot.”

“The staff are worthless human beings.”

“Anyone who eats here must be stupid.”

Japan’s Penal Code separately regulates public insult under Article 231, even where no specific fact is alleged.

Again, whether an individual post actually satisfies a criminal offense is a legal question that depends on context.

But as a review-writing principle, the distinction is easy:

Critique the food, price, waiting time, cleanliness or service you experienced. There is rarely a good reason to review the human worth of the person serving it.

A useful negative review is often more specific, not more aggressive

Compare these two reviews:

“Worst restaurant ever. Don’t go.”

and:

“I visited for lunch. The ramen cost ¥1,200, and for my taste the broth was much saltier than I expected. I also waited about 35 minutes after ordering, so I probably would not return.”

The second review is harsher in one sense because it gives concrete reasons.

But it is also much more useful.

A reader who loves very salty ramen may even decide the criticism sounds like a recommendation.

That is what reviews are supposed to do.

They provide information that lets somebody else make a decision.

The strongest negative review is often not the angriest one. It is the one that clearly separates what happened from how the reviewer felt about it.

What about the opposite problem: pretending bad food was wonderful?

Here the subject becomes strangely inverted.

If somebody privately thinks a meal was mediocre but posts:

“Absolutely amazing! Five stars!”

almost nobody threatens them with a lawsuit.

But if everybody did that, the review system would become useless.

And there is a more serious version of this problem.

Suppose a restaurant provides money, free food or some other benefit and arranges for what looks like an independent customer’s recommendation to be posted without making the advertising relationship apparent.

Japan has specifically regulated this form of stealth marketing since October 1, 2023 under the Act against Unjustifiable Premiums and Misleading Representations.

The Consumer Affairs Agency explains the logic clearly: consumers interpret independent opinions differently from advertising. If something is actually an advertisement but is presented as an ordinary third-party recommendation, consumers can be misled about the nature of the message.

There is an important legal nuance here.

Under Japan’s stealth-marketing rules, the formal regulatory target is generally the business or advertiser whose representation is involved, rather than an influencer simply because they made the post. The Consumer Affairs Agency nevertheless makes clear that reviews and social-media posts arranged by businesses can fall within the scheme.

So an undisclosed glowing review can, in some circumstances, raise a more concrete consumer-protection issue than an ordinary customer honestly saying:

“I didn’t like it.”

AI-generated conceptual illustration of stealth marketing. Japanese rules apply to advertisements that consumers may have difficulty recognizing as business advertising; the image does not depict a specific restaurant or influencer.

A world where only five-star reviews are acceptable is not a review system

Of course restaurant owners dislike bad reviews.

That is entirely understandable.

A small business can spend years building a reputation, and one viral accusation can cause real damage.

But customers also spend real money.

If the food is excellent, they should be free to say so.

If they think it is mediocre, overpriced or unpleasant, there must also be room to say that.

Otherwise a review platform stops functioning as a review platform.

It becomes an advertising board.

The problem is not simply that somebody wrote something negative.

The more serious problems begin when people:

invent experiences they never had;
publish factual accusations they cannot support;
use fake accounts or coordinated attacks;
turn criticism into personal abuse;
or disguise advertising as independent consumer opinion.

AI-generated satirical illustration representing the loss of credibility when every review appears uniformly positive.

So how can you write an honest negative restaurant review?

There is no sentence template that guarantees immunity from every legal dispute.

But there is a big difference between documenting an experience and trying to punish a business.

A responsible negative review might say:

“I visited on Sunday afternoon.”

“I ordered this particular dish.”

“It cost this much.”

“For my taste, it was too salty.”

“I waited approximately 30 minutes.”

“Because of those factors, I would not personally return.”

That gives readers information.

It also leaves room for another customer to have a completely different reaction.

By contrast, statements such as “they always do this,” “the ingredients are rotten,” or “the owner is committing fraud” introduce factual allegations that may require evidence far beyond one disappointing dinner.

Conclusion: criticism is part of what gives reviews value

If every negative restaurant review were treated as illegal interference with business, online ratings would make little sense.

A one-star rating has to be possible for a five-star rating to mean anything.

But freedom to criticize is not a license to fabricate.

There is an important difference between:

“I ate it and didn’t like it.”

and:

“I want to damage this business, so I’ll create a story.”

There is also a difference between:

“The service I received was poor.”

and:

“The person working there is a terrible human being.”

And perhaps most importantly, there is a difference between an independent customer’s five-star review and an advertisement pretending to be one.

A trustworthy review system needs praise, criticism and disagreement. What it does not need is invented reality.

Editor’s Note

If everybody becomes so afraid of writing “I didn’t like it” that every mediocre restaurant quietly receives four stars, there is not much point in checking reviews anymore.

I think people should be able to say that bad food was bad.

But “bad review” and “abuse” are not the same thing.

If I were writing a one-star review, I would not stop at “I’m never going back.” I would explain why I would not go back.

The price, the flavor, the wait, the service — whatever actually happened.

That may be less dramatic than screaming “worst restaurant ever.”

But it is a much stronger review.

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