山空海温泉

The smell of sulfur makes it clear that it's a hot spring. The water is lukewarm, but after a while, it warms up enough that you start sweating nonstop. As of August 13, 2025, the price was 1,000 yen for adults and 500 yen for elementary school students. The facility is like a prefabricated building. The bath is small, barely big enough for six people. There's no soap or shampoo. The changing room is small and there's no air conditioning, so it's difficult to put on a shirt while drenched in sweat. There's no waiting room or seating, so it's a hassle if you leave early. The whole facility is messy and dirty. I might go again if it were around 400 yen. 1,000 yen is fine, though. I don't think it's that easy to find the way from the parking lot to the hot spring prefabricated facility if it's your first time. As you walk along the river with the river on your left, you'll see two or three older men, looking like they've been drinking in the middle of the day and looking quite happy. When you tell the happy men you want to take a bath, they collect the fee and lead you to a building in the back that seems to be the hot spring. The manager is a blue collar guy, so some people may not like him.

I wonder how many people remember the "Yamasukukai Onsen Constitution" (a famous Japanese legal text). This is a lukewarm hot spring with a strong, distinctive character. It's not for everyone. It's an hour's walk from the nearest bus stop (though I doubt many people walk there). A rustic bathhouse with a Showa-era feel, a cluttered reception area, and a prefabricated treatment building. The changing room is small and, of course, has no air conditioning, and there's no shampoo or body soap, yet the bathing fee is ¥1000 (it was ¥500 20 years ago). Only a certain type of patient who is okay with all that can enjoy this exquisite lukewarm hot spring with a rare eggy smell, a rarity in the Osaka area. It's a bicarbonate spring. The source water in the stainless steel bath is around 17.5°C, the heated bath is 39-41°C, and the lukewarm heated bath is 34-36°C. The source water, heated by a boiler, is poured into the heated bath from the tap, and the overflowing water flows into the lukewarm bath. On weekdays when there are fewer customers, the taps are sometimes turned off, so I don't think the hot water quality is always good.

Cold spring water with sodium bicarbonate sulfur. 1000 yen 40-43°C hot water (heated) 32-36°C lukewarm water 18°C cold spring water. The water didn't smell of sulfur, but I only realized after I got home that the smell of sulfur had left its mark on my body. The water felt slightly clingy. (Is it clinging? Or not?) A tiny amount of hot spring minerals floating around. Honestly, 1000 yen is too expensive for this quality of spring water and this small space. When I went in, there were four people in the lukewarm water (full) and two in the hot water, so I could only use the hot water... I had to make do with the hot water for a while. It felt great to alternate between cold water, hot water, and cold water. The changing room was a real disappointment. It smelled almost like urine. When I think about it, 1000 yen is a bit pricey. By the way, the men's bath smelled of sulfur and the ingredients seemed to cling to the skin.

I'd previously been here on a Friday, but it was a regular day off. Note that they're closed on Thursdays and Fridays, so I finally made it. Today, I stopped by after visiting Mt. Myoken. After a few minutes' walk along the river, I saw the hut. I paid the man the 800 yen admission fee. There are two washing areas, three bathtubs: one with 40-43°C water and one with lukewarm water at 32-36°C, and a small cold bath. Stainless steel mugs are provided for drinking in the cold bath. The water is generally clear and colorless, but it has a slight smell of hydrogen sulfide. It's a free-flowing bath, but it's heated. The distinctive smell of kerosene, the fuel, can be heard from outside the window whenever the boiler heats the water. The spring water is a sodium bicarbonate sulfur spring. It's rare to find a place in Osaka where you can enjoy sulfur, so I recommend it for hot spring lovers.

Nose has many establishments along major roads, but this is a minor road to the east, so the owner says, "There's probably nothing here." But, I'm not saying that "nothing here is great." The water has a sulfurous scent and a thick, silky feel on the skin. It's not a fancy facility, but hot spring lovers will love it. The cheap building also makes it feel like a hidden hot spring. The bathroom is clean, and you can enjoy two different temperatures. It's a cold day with snow falling nationwide today, but the outside air was perfect for a bath. No need to even bathe. I felt this was the best natural hot spring quality in Osaka Prefecture.