“The black hot spring is incredibly rich, and you can feel it absorbing into your skin. The moment you step in, you can sense the minerals in the water. The relaxation effect is outstanding, making you want to stay immersed for a long time.”
“The golden hot spring exceeded my expectations. The iron-rich water warms your body thoroughly and helps retain heat, making it difficult to feel chilled afterward. I never expected to find such an authentic hot spring in Tokyo!”
“A hot spring facility that suddenly appears in the middle of a residential area. From the outside, it looks like an ordinary public bath, but inside, there’s a surprisingly authentic natural hot spring. It’s great to have easy access to a genuine onsen in the city.”
“It gets quite crowded on weekends, and since the bathtubs are small, it can feel a bit cramped. Still, the quality of the hot spring is excellent, so a little congestion is acceptable. If possible, I’d prefer to visit on a weekday for a more relaxed experience.”
“The facility itself feels a bit old, but it is well-maintained and clean. The high-quality hot spring makes it a perfect place for those who prioritize the onsen experience over the appearance of the facility.”
“The thick, silky texture of the black hot spring water is amazing. It makes my skin feel incredibly smooth—an absolute delight for onsen lovers! You can really tell that the water is packed with minerals, making me want to visit again and again.”
“The open-air bath is a bit small but still gives a sense of openness. However, due to its popularity, it often gets crowded quickly, making it hard to soak in for a long time.”
“The price is very reasonable, yet you get to enjoy an authentic hot spring. I feel it offers better value than going to a super sento (large-scale public bath). It’s also easily accessible from central Tokyo, making it a great place to visit casually.”
“Unlike a super sento, this place is purely focused on the hot spring experience. It doesn’t have flashy facilities, but if you just want to enjoy high-quality onsen water in a calm atmosphere, this is the place for you.”
“There’s a sauna, but it’s not very spacious, so it’s best to focus on enjoying the hot spring itself. The water quality is so good that the combination of the sauna and cold bath feels amazing.”
Pricing:
Adults: ¥550
Junior High School Students: ¥450
Children: ¥200
Review of the Visit
Relaxing Atmosphere: 2 points (out of 5)
Musashi-Koyama Onsen Shimizu-yu is a conveniently located hot spring in a residential area. However, compared to super sentos with wide-open views or a resort-like atmosphere, it is more everyday life extension. Rather than a tourist destination, it feels more like a place for regular visits.
Quality of the Hot Spring: 5 points (out of 5)
This is the key highlight of Musashi-Koyama Onsen Shimizu-yu! The hot spring quality is exceptionally good, making it hard to believe you’re in central Tokyo. Furthermore, you can enjoy two different types of hot springs.
Black Hot Spring: A sodium-rich moor spring sourced from 200 meters underground, offering excellent moisturizing and skin-enhancing effects.
Golden Hot Spring: An iron-rich spring known for improving blood circulation and relieving fatigue. This type of hot spring is extremely rare in Tokyo.
Various Baths Experiences: 2 points (out of 5)
Compared to super sentos, the number of bathtubs is limited, but the variety is still satisfying.
★ Types of Baths
Indoor Bath (Black Hot Spring)
Open-Air Bath (Golden Hot Spring)
Cold Bath
Sauna
However, the bathtubs are relatively small and tend to get crowded.
Facility : 2 points (out of 5)
There is a relaxation space on the second floor, allowing visitors to unwind after a bath. However, re-entry is not allowed, meaning you must pay again if you want to bathe multiple times. The facility is slightly old but remains clean and well-maintained.
Food: 1 points (out of 5)
There is no restaurant inside the facility, so visitors need to eat at nearby restaurants.
Overall Rating: 2.85 points (out of 5)
Musashi-Koyama Onsen Shimizu-yu occupies a unique position between a public bath and a super sento. Its greatest appeal is its accessibility and the ability to enjoy authentic hot springs in the heart of Tokyo. It can be considered part of the same category as Mikoku-yu (Ranked 20th), Tenjin-yu (Ranked 16th), and Sachi-no-Yu (Ranked 2nd), but what makes it stand out is the availability of two different types of hot springs.
As a day-trip onsen, it lacks scenic views and a strong extraordinary feeling, but for those who prioritize high-quality hot spring water, it is highly recommended. If you’re looking for a genuine onsen experience that super sentos can’t offer, this is the perfect spot.
Pros:
✅ Authentic hot spring experience in Tokyo ✅ High-quality Black Hot Spring and Golden Hot Spring ✅ Easily accessible for a casual day trip
Cons:
⚠ Small bathtubs, often crowded ⚠ Slightly old facility ⚠ No in-house dining, so meals must be eaten elsewhere
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