It is located in the upper reaches of the Serpentine River, and has come to be called by this name because the water flows down in a bamboo blind shape over a 20m wide bedrock with a height of about 3m. There are many maples and maples in the vicinity, and the autumn leaves are also wonderful. Around July, Genji fireflies fly around, and you can see a fantastic sight in the sound of the waterfall flowing down. <Access> Get off at "Kowakidani Station" on the Hakone Tozan Railway and walk for about 15 minutes.