PROBLEM TO BE SOLVED: To provide bath agent compositions that can effectively suppress occurrence of undissolved residues after putting into bath water while giving a satisfactory refreshing feeling, by containing aluminum potassium sulfate.SOLUTION: A bath agent composition contains the following components (A), (B), (C), and (D): (A) carbonate； (B) an aluminum potassium sulfate anhydride or an aluminum potassium sulfate hydrate； (C) 0.001 mass% or more to 4 mass% or less of sodium metaphosphate； and (D) one or more surfactants selected from anionic surfactants and nonionic surfactants, the mass ratio ((C)/(B)) of the content of the component (C) and the content of the component (B) being 0.01 or more to 1 or less.SELECTED DRAWING: None
