No Grey Zone: Japan Closes In on a ¥1.24 Trillion Online Casino Market

Japan has no licensed online casino market. It does, however, have an estimated 3.37 million people who have played at overseas casino sites and an offshore market handling more than ¥1.24 trillion in bets annually.

That contrast has become increasingly difficult for the country’s authorities to ignore.

Japan has now moved beyond warning individual players that online casinos are illegal. Its developing strategy targets the infrastructure surrounding the industry, including advertising, social media promotions, payments and, potentially, access to casino websites themselves.

At the same time, construction is underway on Japan’s first legal land-based casino resort in Osaka. It creates an apparent contradiction: why is the country preparing to welcome casino players through the doors of an MGM resort while trying to keep them away from online blackjack, roulette and slots?

The answer lies in the type of market Japan is prepared to regulate and the parts of the gambling industry it believes it can control.

Is Online Gambling Legal in Japan?

Playing at an online casino from inside Japan is illegal. This remains the case even if the operator is located overseas and holds a licence issued by another jurisdiction. The legality of the activity is determined under Japanese law and by the player’s location.

Japan’s government stresses that there is no legal grey area: a person gambling through an overseas casino from within Japan may be committing an offence. Ordinary gambling can result in a fine of up to ¥500,000, while habitual gambling can carry a custodial sentence of up to three years.

The same basic restriction applies to general offshore sports betting. Japan has not established a licensing system through which international sportsbooks can legally accept local players.

Nevertheless, it would be inaccurate to claim that every form of online wagering is prohibited. Japan allows betting through authorised public systems covering horse racing, keirin cycling, motorboat racing and motorcycle auto racing. Certain lotteries and football pools are also permitted, and authorised tickets can be purchased through digital channels. Japan therefore has legal online betting products, but it does not have a regulated commercial online casino or open sportsbook market.

The Scale of Japan’s Offshore Casino Market Is Hard to Ignore

Based on data from a survey of 27,145 people aged between 15 and 79, approximately 3.37 million people in Japan had used an online casino. Around 1.97 million were thought to be current players.

Estimated annual betting reached approximately ¥1.2423 trillion. This figure represents the total amount wagered, rather than operator revenue or the amount lost by players, but it still demonstrates the size of the activity taking place outside Japan’s authorised gambling system.

The study also exposed a serious awareness problem. Approximately 44% of the users and non-users surveyed did not recognise that using an online casino from Japan was illegal.

This misunderstanding did not develop in isolation. The National Police Agency of Japan, a body behind the survey, examined quite a few online casino sites considered likely to attract traffic from Japan. All of those sites held gambling licences issued overseas.

This does not necessarily mean the operators were intentionally ignoring Japanese law. Rather, it illustrates the gap between international accessibility and domestic authorisation. A casino may be legally licensed in its home jurisdiction while its use remains prohibited in another country. Japan’s authorities are now placing greater emphasis on clarifying that accessibility and overseas licensing do not amount to permission to gamble from within the country.

How Japan Is Targeting the Wider Casino Ecosystem

Following a broader global trend, Japan is looking beyond casino operators and focusing on the promotional channels through which players discover and access gambling platforms.

An amendment to the Basic Act on Measures Against Gambling Addiction prohibits presenting illegal online gambling websites or applications to unspecified people in Japan. It also prohibits distributing information intended to direct or encourage people to participate in illegal online gambling.

This reaches considerably further than conventional paid advertisements. The restrictions can cover casino banners, ranking websites, recommendation pages, registration guides, social media promotions, and videos directing viewers towards an operator. This means that a publisher does not need to operate the casino or handle players’ money to come within the government’s enforcement strategy. Content designed to recruit Japanese customers or facilitate their use of an offshore casino may itself be targeted.

The amended act does not contain separate criminal penalties for every violation. Its immediate effect is instead to establish a clearer legal basis for authorities to request removals, involve internet platforms and treat promotional material as illegal online information.

Enforcement Is Moving Beyond Individual Players

Police enforcement has also increased. The latest National Police Agency figures show enforcement reaching a record level, with police taking action against 317 suspected online casino users and industry participants, compared with 279 in the preceding reporting period.

In numerical terms, that is a tiny fraction of the estimated user population. Arresting millions of individual players is neither realistic nor likely to eliminate the market. Japan’s wider strategy therefore concentrates on the points through which offshore casinos acquire customers and receive money.

Payments are one of those pressure points.

The government’s gambling-addiction plan called for cooperation between the National Police Agency, Financial Services Agency and Ministry of Economy, Trade and Industry. Proposed measures included warning businesses against processing casino payments and encouraging credit card issuers and international card networks to remove offshore casino operators from their systems.

Some financial institutions have already responded. Seven Bank, for example, warned customers that it might restrict transactions through an account if it discovered transfers to an online casino-related recipient.

Payment restrictions will not necessarily remove every route into the market. Offshore operators may use intermediaries, alternative payment providers or cryptocurrency. Nevertheless, combining financial controls with advertising removals makes the player journey more difficult at several stages: discovering a casino, registering and depositing money.

Could Japan Block Casino Websites?

Website blocking may become the next major step, but Japan had not introduced a comprehensive blocking regime yet.

Government advisers have considered whether internet service providers should prevent users from reaching identified casino websites. Supporters argue that blocking would address the most obvious weakness in the existing system: illegal sites can remain readily accessible even after the government warns people not to use them.

The proposal has also raised constitutional and privacy concerns. Blocking may require telecommunications companies to identify the destinations users are attempting to reach and interfere with those communications. Critics question how this would interact with Japan’s constitutional protection of the secrecy of communications.

For now, blocking remains an option rather than an established policy. Authorities are expected to assess whether less intrusive measures, including content removal, payment disruption, public education and cooperation with overseas regulators and operators, can reduce participation first.

Osaka’s Casino Does Not Mean Online Regulation Is Coming

Japan’s approach appears more contradictory when considered alongside MGM Osaka, the country’s first approved integrated resort. The development on Yumeshima will combine a casino with hotels, restaurants, entertainment, retail and conference facilities. MGM Resorts and Japan’s ORIX are the principal partners behind the project.

The resort represents a significant change in Japan’s physical casino landscape, but it should not be interpreted as the first stage of online casino liberalisation.

MGM Osaka is based on a deliberately limited regulatory model. The casino will operate at an approved physical location, under Japanese supervision and with rules governing entry and responsible gambling. Japanese residents will face an admission charge and restrictions on how frequently they can visit, while identity checks will help enforce those limits.

The government can supervise the operator, premises and customer journey in ways that are much harder to reproduce across hundreds of offshore websites.

Japan’s policy is therefore selective about the gambling it permits and the conditions under which it is offered. Public racing, lotteries and the future Osaka casino operate through specifically authorised systems. Offshore casinos sit outside those systems, even if they hold reputable licences elsewhere.

A Market Moving Further From Regulation

For players hoping Japan might follow European countries in licensing online casinos, the recent direction offers little encouragement.

Japan is not preparing a domestic iGaming licensing framework. It is building a more comprehensive system for keeping offshore casinos outside its market. Affiliates, influencers, payment providers, technology companies and potentially internet service providers are all becoming part of that effort.

The greatest challenge will be converting legal clarity into practical market control. Millions of people have already used online casinos, and the estimated amount wagered indicates that demand will not disappear simply because the government repeats that the activity is illegal.

Even so, the idea of a tolerated grey market is becoming harder to sustain. An overseas licence does not authorise play from Japan, a Japanese-language website does not establish legality, and the continued accessibility of a casino does not make it safe from enforcement.

Japan may be building its first casino, but online it is closing the door.