The present invention discloses a method for producing an effervescent bath agent composition, including the following steps: step 1: mixing an organic acid, not less than 0.1 parts by mass, to 100 parts by mass of the organic acid, of a nonionic surfactant and a water-soluble binder to obtain a mixture step 2: granulating, compress-molding, or and compress-molding after granulating, the mixture obtained in step 1 to obtain a granulated or compress-molded product and step 3 : mixing the granulated or compress-molded product obtained in step 2 with a carbonate.
