Radium Onsen - A Tattoo-Friendly Hot Spring in Osaka City, Osaka

Radium Onsen, established in 1924, stands as a living testament to Osaka's bathing culture, offering a rare combination of historical significance and inclusive policies. This century-old bathhouse, nestled in the vibrant Shinsekai district near the iconic Tsutenkaku Tower, welcomes visitors through its doors into a world where traditional Japanese bathing rituals meet modern accessibility. Unlike many conventional onsen throughout Japan, Radium Onsen explicitly welcomes tattooed guests without restrictions, making it an invaluable destination for international travelers seeking authentic Japanese bathing culture without the anxiety of potential rejection. The onsen's radium-infused waters—known locally for their therapeutic properties—create a uniquely Osakan experience that combines cultural immersion with genuine relaxation.

Fully Tattoo-Friendly: Radium Onsen welcomes guests with tattoos of any size, design, or coverage without restrictions or special requirements, providing a stress-free bathing experience for all visitors regardless of body art.

• Historic Authenticity: Experience a nearly century-old bathhouse (est. 1924) that preserves traditional Osaka bathing culture 
• Tattoo-Friendly Environment: Enjoy complete acceptance without the need to cover tattoos or explain your body art 
• Therapeutic Radium Waters: Benefit from the unique mineral composition said to relieve muscle pain and improve skin health 
• Affordable Cultural Experience: Access authentic Japanese bathing at budget-friendly prices (¥500) compared to luxury onsen 
• Iconic Location: Combine your bath with exploration of Shinsekai district and the famous Tsutenkaku Tower just steps away 
• Local Immersion: Bathe alongside Osaka residents for a genuine cultural exchange rarely found in tourist-oriented facilities

Stepping into Radium Onsen's bathing area reveals a collection of different baths, including the centerpiece indoor pools and a refreshing open-air bath where you can soak while feeling the gentle Osaka breeze. The unique selling point here is the radium-infused water, which has a distinctly viscous quality that leaves your skin feeling remarkably soft and renewed after bathing. The slightly alkaline water (pH ~8.5) maintains a comfortable temperature between 40–42°C, ideal for easing tight muscles after exploring Osaka's attractions. The mineral composition, particularly the natural radium content, is renowned among locals for alleviating neuralgia, improving circulation, and boosting metabolism. Many visitors report a pleasant tingling sensation during their soak—a sign of the water's therapeutic properties stimulating blood flow and rejuvenating tired bodies.

• Standard Admission: ¥500 (includes rental towel) - Sauna Access: Included in admission 
• Additional Towels: ¥100 each 
• Soap/Shampoo: Available for purchase or bring your own

No reservations required—simply arrive during operating hours (typically 6:00 AM to 10:00 PM daily) for this walk-in friendly establishment that welcomes spontaneous visits. 

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📞 Phone: +81-6-6641-5307 

📍 Address: 3-2-8 Ebisuhigashi, Naniwa-ku, Osaka 556-0002, Japan 

• Monday: 10:00–20:00
• Tuesday: 10:00–20:00
• Wednesday: 10:00–20:00
• Thursday: 10:00–20:00
• Friday: 10:00–20:00
• Saturday: 10:00–20:00
• Sunday: 10:00–20:00