PROBLEM TO BE SOLVED: To provide a soap composition fast in melt during use, having high bubble power, hardly swelling or flowing out at a normal temperature, less in irritation to skin or eye and being environmental friendly, and a manufacturing method therefor.SOLUTION: There is provided a soap composition obtained by mixing a mix aliphatic acid comprising aliphatic acid having 12 to 24 carbon atoms and magnesium hydroxide or magnesium oxide, then saponifying by alkali of potassium hydroxide and sodium hydroxide having a mass ratio of potassium hydroxide/sodium hydroxide of 90/10 to 0/100. There is provided a soap composition with magnesium hydroxide or magnesium oxide of 0.1 to 7 pts.mass based on 100 pts.mass of the total mass of potassium hydroxide and sodium hydroxide. There is provided a soap composition where the aliphatic acid is saturated aliphatic acid, the soap composition further containing polyhydric alcohol and water with raw material soap of 20 to 40 mass%, the polyhydric alcohol of 20 to 50 mass% and water of 11 to 50 mass%.【課題】使用時に溶け出しが早く、高い気泡力を有すると共に、常温において膨潤したり流れだしたりすることがなく、また皮膚や目に対して刺激が少なく、環境にも優しい石鹸組成物及びその製造方法の提供。【解決手段】炭素数が１２～２４の脂肪酸からなる混合脂肪酸と、水酸化マグネシウム又は酸化マグネシウムを混合後、水酸化カリウム／水酸化ナトリウムの質量比が９０／１０～０／１００である水酸化カリウムと水酸化ナトリウムのアルカリにて鹸化して得られる石鹸組成物。ここで水酸化カリウムと水酸化ナトリウムの合計質量１００質量部に対して、水酸化マグネシウム又は酸化マグネシウムは０．１～７質量部である石鹸組成物。前記脂肪酸は飽和脂肪酸であり、更に、多価アルコール及び水を含み、原料石鹸を２０～４０質量％、多価アルコール類を２０～５０質量％、水分を１１～５０質量％含む石鹸組成物。【選択図】なし
