PROBLEM TO BE SOLVED: To provide a solid bath agent used for bath, shower, shampoo, esthetic and the like and being excellent in cleaning performance of mineral impurities.SOLUTION: A solid bath agent contains bicarbonate (sodium hydrogencarbonate or potassium hydrogencarbonate) and at least one organic acid selected from a citric acid, a fumaric acid, a succinic acid and a malic acid, where the PH of an aqueous solution immediately after dissolving the solid bath agent is 5.5 to 9.0 and a bicarbonate ion blocking substance is not substantially contained.