Time Out says
Convenient it ain't, but this onsen complex on the outskirts of Tokyo offers attractive rotenburo outdoor baths, indoor tubs and saunas at a fair price. Roten Garden bills itself as Machida's first authentic onsen, drawing its sodium- and chloride-rich hot spring water – said to be good for muscle pain and achy joints – from a depth of nearly 1,400m underground. The male and female sections rotate every day to keep things interesting, and there's also a stone sauna that you can use for an additional ¥500. Given the remote location, most people get there by car – but if you're heading via Hashimoto Station, there's a shuttle bus that leaves on the hour from outside the south exit, between 10am and 6pm.
358 Aiharamachi, Machida-shi
|Transport:||Hashimoto Station (Yokohama, Sagami, Keio Sagamihara lines), then bus or taxi|
|Price:||Adults ¥740 (Mon-Fri) / ¥890 (Sat, Sun & hols), children ¥300 (Mon-Fri) / ¥350 (Sat, Sun & hols)|
|Opening hours:||Mon-Fri 10am-12midnight; Sat, Sun & hols 9am-12midnight|