To solve the various problems in the conventional sauna bath which requires a sensor and a control unit to control the balance between the heat necessary to make a negative ion and a mineral ingredient to be radiated from ores such as granite porphyry or tourmaline and the temperature of the sauna bath, and also it requires a lot of cost and management to operate, and moreover, in order to improve blood circulate for improving body metabolism by perspiration, prolonged bathing is necessary which causes heavy load on an elderly person.

In this sauna bath, ores such as granite porphyry or tourmaline are laid all over on a stone floor of the sauna bath, natural ores of permanent magnetic properties are laid on the top surface of the layer in equal thickness, and a feeding port and a discharging port for circulating warm water in the stone floor of the sauna bath are provided at any proper location. Bathers lie down on the natural ores of permanent magnetic properties.