PROBLEM TO BE SOLVED: To provide a solid bath agent which is less likely to cause capping or sticking during compression molding and has good moldability, and is excellent in warming speed and foaming property at the time of use. The following component (A) and component (B): (A) Carbonate (B) A solid bath agent containing an organic acid containing fumaric acid (B1) and tartaric acid (B2), and the mass ratio of the component (B2) to the component (B1) [(B2) / ( B1)] is 0.01 or more and 1.3 or less, the total amount of the component (B1) and the component (B2) in the component (B) is 80% by mass or more, and the component (B1) in the solid bath preparation. ) And the component (B2) in an amount of 35% by mass or more, a solid bathing agent. [Selection diagram] None【課題】圧縮成形時にキャッピングやスティッキングが発生し難く成形性が良好で、使用時には温まり速さと発泡性に優れる固体浴用剤を提供する。【解決手段】下記成分（Ａ）及び成分（Ｂ）： （Ａ）炭酸塩 （Ｂ）フマル酸（Ｂ１）及び酒石酸（Ｂ２）を含む有機酸を含有する固体浴用剤であって、成分（Ｂ１）に対する成分（Ｂ２）の質量比［（Ｂ２）／（Ｂ１）］が０．０１以上１．３以下であり、成分（Ｂ）中の成分（Ｂ１）及び成分（Ｂ２）の合計量が８０質量％以上であり、前記固体浴用剤中の成分（Ｂ１）及び成分（Ｂ２）の合計量が３５質量％以上である、固体浴用剤。【選択図】なし
