Provided is a detergent composition with soap having excellent water solubility and hard-water resistance. The detergent composition of the present invention contains polyglycerine monoalkyl ether represented by the following formula (1) and C6~22 fatty acid alkali metal salts,RO-(C3H6O2)n-H (1)(in the formula, R represents C14~24 straight chain or branch chain aliphatic hydrocarbon group ; n represents average polymerization degree of glycerine and represents 8~20).本發明提供一種對水之溶解性及耐硬水性優異的含皂之洗淨劑組成物。本發明之洗淨劑組成物係含有下式(1)所表示之聚甘油單烷基醚與碳數6~22之脂肪酸鹼金屬鹽,RO-(C3H6O2)n-H (1)(式中,R表示碳數14~24之直鏈狀或支鏈狀脂肪族烴基。n表示甘油之平均聚合度且為8~20)。
