PURPOSE: To provide the titled bathing agent composed mainly of adipic acid and sodium bicarbonate and/or sodium carbonate, effective to keep the bicarbonate ion concentration, and capable of giving the remedying effect of a hot spring.

CONSTITUTION: The objective foamable bathing agent contains sodium bicarbonate and/or sodium carbonate and adipic acid as essential components, wherein the molar ratio of adipic acid to the carbonate falls within the range of ABCD in the figure. The bathing agent may be compounded freely with one or more salts e.g. sulfate such as sodium sulfate, chloride such as sodium chloride, etc. in an amount of ≤50wt%. The effect of hot spring can be further promoted by adding perfumery, pigment, vitamins, active component of hot spring, various extracts, crude drugs, etc. to the agent.

EFFECT: The agent can be stored relatively stably for a long period, and the damage of the bath heater and bathtub can be mitigated.