One of Japan’s biggest gambling events this weekend will not take place inside a casino, on a racetrack or during a football match.
It will happen on water.
On 2 August, six boats will contest the 優勝戦 (yūshōsen) — championship race of the SG第31回オーシャンカップ — 31st Ocean Cup at ボートレースびわこ — BOAT RACE Biwako in Shiga Prefecture. Betting on the final race is scheduled to close at 16:35 JST.
Outside Japan, betting on motorboats may sound unusual. Inside the country, it forms part of a nationwide industry that generated ¥2.67 trillion—approximately US$16.3 billion—in betting turnover during the 2025 fiscal year.
Six boats, three laps and a flying start
The sport is traditionally known as 競艇 (kyōtei), although the industry now promotes it under the English name BOAT RACE.
Every race uses six colour-coded boats. They complete three anticlockwise laps of a 600-metre course, covering 1,800 metres in total.
The start is particularly important. Instead of waiting motionless for a signal, the boats approach the starting line at speed and must cross it during a designated one-second window.
Crossing too early produces a フライング (flying start), marked with an “F”, and the boat is removed from the race. Bets placed on it are refunded.
The combination of positioning, water conditions, engine performance and the initial turn can decide a race within seconds.
Bets start at ¥100—about US$0.61. The betting tickets are known locally as 舟券 (shūken).
Players can select a simple winner or predict combinations involving the first two or three boats, including the exact finishing order. Japan has 24 BOAT RACE venues, but the physical tracks now represent only one part of the market.
More than ¥2.17 trillion—approximately US$13.2 billion—of fiscal-year turnover came through telephone and online betting. That means more than 80% of the industry’s wagers were placed remotely.
Why is it legal?
BOAT RACE belongs to a category called 公営競技 (kōei kyōgi) — publicly operated betting sports.
Japan permits four principal forms:
Horse racing.
Motorboat racing.
Keirin track cycling.
Motorcycle autorace.
These markets are treated differently from private casino gambling because they operate under specific national legislation and public control.
Motorboat racing is governed by the Motorboat Racing Act, first enacted in 1951. Authorised local governments organise the races, while Japan’s Ministry of Land, Infrastructure, Transport and Tourism supervises the system.
The distinction is not that wagering ceases to be gambling. It is that the activity is confined to a regulated public structure with predetermined rules for distributing the money.
Approximately 75% of betting turnover is returned to winning ticket holders. Parts of the remainder finance race operations, the Japan Motorboat Racing Association and local public finance.
Around 3.1% is transferred to the Nippon Foundation, which funds maritime programmes and other public-interest projects. Profits retained by the organising municipalities can enter local budgets for schools, hospitals, public housing, sports facilities and other services.
Japan has therefore not eliminated gambling through prohibition. It has divided the market into authorised and unauthorised forms—and built some of the legal ones into public finance.
A large market hiding in plain sight
BOAT RACE illustrates why looking at Asian gambling only through casinos and Western-style sports betting produces an incomplete picture.
The 2025 fiscal-year turnover was 5.6% higher than the previous year and set another record. Its scale places Japanese boat racing alongside major regulated gambling sectors internationally, despite receiving little attention outside the country.
Sunday’s Ocean Cup final is the visible sporting event: six racers, one championship and a few minutes on the water.
Behind it sits something much larger—a 74-year-old legal betting system connecting professional racing, online wagering, municipal budgets and public funding.
For international gaming companies, Japan’s gambling market can appear unusually restrictive. BOAT RACE shows the more complicated reality.
Japan does allow large-scale gambling. It simply matters enormously who operates it, what law authorises it and where the money goes.
We track how money, players and regulation move across East Asia's gaming markets — including the parts that don't show up in the official figures. If that's your world, reply. The best context usually comes from comparing notes.
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East Asia Reports
Web: eastasiareports.com · Email: [email protected]
Author — Adrià Mas Rodríguez