Is there a permanent poker room in Shinjuku Sumitomo Building Triangle Square?

No. Triangle Square is a multi-purpose event plaza. Poker is only available when a major tour (like WPT or JOPT) books the space for a specific festival. For daily poker in Shinjuku, players visit rooms like Casino Stadium or Japan Poker Club .

How do I find the poker area inside the building?

The poker tournaments are typically held on the B2/B1 Level in the main “Triangle Square” atrium. Look for the massive glass-roofed plaza area, it is impossible to miss once you enter the Shinjuku Sumitomo Building.

Can I win cash at events here?

No. In compliance with Japanese Law, all poker events at Triangle Square are “Amusement” based. Prizes consist of non-cash sponsorship packages for international real-money events, trophies, and ranking points.

What are the nearest train stations?

The venue is directly connected to Tochomae Station (Toei Oedo Line, Exit A6). It is also an 8-minute walk from the West Exit of JR Shinjuku Station and a 4-minute walk from Nishi-shinjuku Station (Marunouchi Line).

Are there food options available during breaks?

Yes. The Shinjuku Sumitomo Building itself contains a wide variety of restaurants, cafes, and bars directly surrounding the plaza, ranging from quick-service noodles to high-end dining.

Shinjuku Sumitomo Building Triangle Square Poker Guide 2026

Derick ElominaAuthor

Derick Elomina discovered poker at 14, playing home games with his high school friends. What began as a pastime quickly grew into a passion that shaped his career. By 21, he entered the poker industry as a field reporter — just old enough to step foot inside the casino. Starting as a hand reporter, he steadily honed his craft, blending sharp observation with growing writing skills. Known for his dedication, he constantly roams the floor to capture the action, conduct interviews, and deliver live updates. With a strong commitment to the game and a passion for telling poker’s stories, Derick continues to build his path in the industry.

Updated: 2026.02.24

Shinjuku Sumitomo Building Triangle Square (also known as Sankaku Hiroba) is one of Tokyo’s most impressive all-weather event spaces, featuring a massive glass roof that creates a stunning, light-filled “indoor-outdoor” atmosphere. Located in the heart of the Nishi-Shinjuku skyscraper district, this 3,245m² plaza is a landmark of urban redevelopment. In the 2026 poker circuit, it serves as a prestigious flagship venue for Japan’s largest “Mind Sports” festivals. While not a permanent card room, its immense scale and central Shinjuku location make it the preferred choice for record-breaking events like WPT Japan and the Japan Open Poker Tour (JOPT) .

Why Shinjuku Sumitomo Building Triangle Square?

Massive Tournament Capacity: As one of the largest indoor plazas in Japan, Triangle Square can accommodate over 150 tables simultaneously. It is one of the few venues in Tokyo capable of hosting the massive overflow fields seen in 2026’s “Mega-Festivals.”
The WPT Japan Headquarters: The venue is historically the primary live host for WPT Japan. In late 2025 and early 2026, it continues to be the site where online qualifiers and live entrants converge for the final stages of the championship.
Celebrity & High-Stakes Action: Triangle Square is known for attracting mainstream attention. It has famously hosted stars like GACKT and international legends like Phil Ivey , bridging the gap between niche poker and high-profile Japanese entertainment.
Architectural Grandeur: The 25-meter high glass ceiling provides an open, airy feeling rarely found in basement-level gaming rooms, offering a professional and prestigious “Grand Final” vibe.

📐
SPACE
3,245m² Plaza

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WPT HUB
Live Phase Partner

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STATUS
Premier Tokyo Arena

The 2026 Shinjuku Tournament Experience

Participating in an event at Triangle Square is a distinct experience compared to the club-style rooms in Shibuya or Ginza. During major series, the plaza is transformed into a sea of poker tables, complete with massive LED screens and professional RFID livestream stages. The 2026 season has seen a significant increase in international participation here, with JOPT and WPT events offering “Sponsorship Packages” that draw players from across Asia and beyond.

The venue is part of the Shinjuku Sumitomo Building complex, which underwent a total renovation in 2020. This means players have immediate access to high-end restaurants and the “Shinjuku Sumitomo Hall” for overflow events. Its proximity to the Tokyo Metropolitan Government Building and the vibrant Kabukicho district (a 10-minute taxi ride away) allows for a seamless transition from high-intensity tournament play to Tokyo’s world-class nightlife.

Venue Logistics & Contact

📍 Address: Shinjuku Sumitomo Building B2-1F, 2-6-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo 163-0290, Japan.

📞 Phone: +81 3-3346-1396 (Building Service Center)

📧 Digital Contact: Official inquiries can be made via the Sankaku Hiroba Website.

📝 Entry & Requirements: Hours vary by specific event schedule. A valid Photo ID and registration via the event’s official app (e.g., JOPT’s GameID or WPT Global) are typically required for entry.

💠 Triangle Square Official Updates

Check the JOPT or WPT Japan official calendars for the next festival dates at the Shinjuku Sumitomo Building Triangle Square.

Official Website
Access Map