To solve the problem of a conventional low-temperature sauna, wherein the space is just enough for one or few persons to sit down so that a user has a shut-up feeling, on the other hand, in a high-temperature sauna, a user has to spend lag time in a high-temperature atmosphere till sweating is caused, which puts a considerable burden on aged or physically weak persons, especially exerts a great influence upon the heart and blood pressure.

This house for a low-temperature sauna is provided with a door 1a, a closed house 1 having enough space, a floor surface 2 in which heat accumulator material 2a mixed with ceramics for radiating far infrared rays is laid in the chamber, a heating means 3 disposed in the heat accumulator material of the floor surface, a minus ion generating means 4 for generating minus ions, and a sidewall surface 5 formed by mixing diatomaceous earth with the wall material of the chamber and stretched.