The purpose of the present invention is improving the foam quality of the fatty acid soap, and providing a solid soap containing a fatty acid soap 20-70% by mass, a dimethyl diallyl ammonium chloride / acrylamide polymer, and a high polymerization polyethylene glycol.本發明所欲解決之課題係改善脂肪酸皂之泡質。本發明提供一種固態肥皂,其係在含脂肪酸皂20至70質量%之固態肥皂中,包含氯化二甲基二烯丙基銨/丙烯醯胺聚合物、與高聚合聚乙二醇。