PROBLEM TO BE SOLVED: To provide a granular bath agent which produces bubbles over a sufficiently long time, yields a sufficiently high carbon dioxide gas concentration, has no disadvantages such as incomplete dissolving, and imparts an excellent appearance to bath water.SOLUTION: The granular effervescent bath agent comprises (A) 20-70 mass% dialkali metal salt of carbonic acid with an average particle size of 100-750 &mum, and (B) 30-80 mass% malic acid. The dialkali metal salt of carbonic acid accounts for 75-100 mass% of the total mass of effervescent carbonates.COPYRIGHT: (C)2009,JPO&INPIT【課題】十分に長い発泡時間を有し、十分に高い炭酸ガス濃度が得られ、かつ溶解残り等の欠点がなく、浴湯外観にも優れる粒状浴用剤を提供する。【解決手段】次の成分(A)及び(B):(A)平均粒子径が100~750μmの炭酸ジアルカリ金属塩 20~70質量%、及び(B)リンゴ酸 30~80質量%を含有し、発泡性炭酸塩全量中の炭酸ジアルカリ金属塩量が75~100質量%である粒状発泡性浴用剤。【選択図】なし