PROBLEM TO BE SOLVED: To provide a granular effervescent bath salt having fine effervescence of carbon dioxide gas, especially excellent in fine effervescence for about 30 seconds from immediately after being put into a bath (initial fine effervescence), and excellent in subsequently lasting fine effervescence.SOLUTION: The bath salt contains (A) a granulated substance containing an organic acid, an oil component, a nonionic surfactant, and a water-soluble binder, (B) a carbonate, and (C) a tartaric acid. The bath salt has excellent fine effervescence immediately after being put into a bath, and excellent lasting fine effervescence.COPYRIGHT: (C)2011,JPO&INPIT【課題】炭酸ガスの微細発泡性、特に浴用剤を浴水に投入した直後から投入から30秒程度までの微細発泡性(初期微細発泡性)と、その後の微細発泡の持続性の両方が共に優れた粒状発泡性浴用剤の提供。【解決手段】(A)有機酸、油性成分、非イオン界面活性剤、水溶性バインダーを含む造粒物、(B)炭酸塩、及び、(C)酒石酸を含有する粒状発泡性浴用剤であり、浴水に投入直後の微細発泡性及びその持続性が優れた粒状発泡性浴用剤。【選択図】なし