Japan online betting market — May 2026
In May 2026 the online betting and casino market in Japan drew about 4.6M website visits across 8+ operators tracked by DataGlass; the market fell 35% month-over-month. Rainbet leads, drawing 62.1% of traffic, and the top three operators together hold 95.3%.
Top operators by traffic
| Operator | Monthly visits | Share | Rank | Search | MoM |
|---|---|---|---|---|---|
| Rainbet | 2.9M | 62.1% | #1 | #2 | -49% |
| 1X Bet | 832.8K | 18.1% | #2 | #4 | +41% |
| Shuffle | 696.5K | 15.1% | #3 | #3 | +23% |
| MelBet | 126K | 2.7% | #4 | — | — |
| Williamhill | 60.4K | 1.3% | #5 | #5 | — |
| M88 | 17.8K | 0.4% | #6▼2 | #6 | -29% |
| Stake | 10.4K | 0.2% | #7 | #1 | — |
All figures are web traffic (website visits); activity inside mobile apps is not captured by web measurement. Share = operator's percentage of the market's measured traffic. MoM = month-over-month change in visits, and the arrow by the rank shows the position change versus last month. Search = the operator's rank by search demand (Google Trends) among the operators shown — compare it with the traffic rank to see whether a brand is pulled by real demand or buys its traffic. Figures aggregate each operator's active domains, including mirror sites.
Japan · May 2026
This month 1X Bet grew fastest in Japan (+41%) — a signal of where the market's traffic is shifting.
Search demand ranks the market differently from traffic: Stake sits at #1 in search demand but #7 by traffic — interest the market hasn't fully converted into visits; while 1X Bet is #2 by traffic yet only #4 in search — traffic pulled by paid acquisition more than by organic demand.
Frequently asked questions
Which is the biggest online betting site in Japan?
Rainbet leads in Japan with 62.1% of traffic in May 2026.
How big is the online betting market in Japan?
About 4.6M website visits per month across 8+ operators (May 2026).
Who are the top operators in Japan?
Top by traffic: Rainbet (62.1%), 1X Bet (18.1%), Shuffle (15.1%), MelBet (2.7%), Williamhill (1.3%).
About this data
Independent, measured monthly. Figures aggregate each operator's active domains (including mirror sites) and are updated every month.