Hot sprigs elements and balneological effects of Tokyo 23 wards, which is not recognized as hot spring region were considered. The density of the hot spring’s source in this region is high compared to other parts of the country. Moreover, a useful element and temperature for the balneological treatment was confirmed by the hot springs with deep digging in a lot of places.  The hot springs in Tokyo can be classified into the NaCl strong salt hot springs, NaHCO3, and the sodium metasilicates. The strong Na-Cl (salt) springs are recognized in hot springs found by deep digging, and exists everywhere in Tokyo. The hot springs of the NaHCO3 are localized in Ohta ward by moderate depth digging. The hot springs including with the rich sodium metasilicates in Ohta ward by shallow digging. If the hot springs in Tokyo are to be used the balneologically, the following effects are expected.  Thermal and warm keeping effects can be expected from the strong Na-Cl (salt) springs. Cleanness and smoothing effects of the skin can be expected of NaHCO3. Hyperkeratosis of the skin can be expected from rich sodium metasilicates.