PROBLEM TO BE SOLVED: To provide a solid soap composition which can obtain a creamy and elastic foam quality suitable for washing the skin and a smooth feeling after washing and has a good permeation feeling of a skin lotion used after washing.SOLUTION: There is provided a solid soap composition which comprises 80 to 94.98 mass% of (a) component, 0.01 to 10 mass% of (b) component, 0.01 to 10 mass% of (c) component and 5 to 18 mass% of (d) component, where (a) component is a linear saturated aliphatic acid salt having 12 to 18 carbon atoms is (b) component is a polyglycerol having an average polymerization degree of 2 to 10, (c) component is lactic acid or a salt thereof and (d) component is water.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】肌の洗浄に適したクリーミーで弾力のある泡質が得られると共に、洗浄後にすべすべとした感触が得られ、洗浄後に使用する化粧水の浸透感が良好である固形石けん組成物の提供。【解決手段】下記に示す（ａ）成分を８０～９４．９８質量％、（ｂ）成分を０．０１～１０質量％、（ｃ）成分を０．０１～１０質量％、（ｄ）成分を５～１８質量％含有する固形石けん組成物。（ａ）成分：炭素数１２～１８の直鎖飽和脂肪酸塩（ｂ）成分：平均重合度２～１０のポリグリセリン（ｃ）成分：乳酸または乳酸塩（ｄ）成分：水【選択図】なし
