In recent years, the common appealing points of body soap have been “moistening the skin”, “mild to the skin” and “lasting fragrance”. According to our survey, we found that many women place importance on the moisturizing effect when purchasing body soap. However, more than half of consumers cannot actually feel the moisturizing effect. We considered the possibility that the moisturizing ingredients were washed off easily so that it was difficult to realize the moisturizing feeling. Therefore, we developed a body soap containing moisturizing ingredients which tend to remain on the skin by utilizing a complex of an anionic surfactant and a cationic polymer. Moreover, we clarified that the complex was retained on the skin surface after washing to express a suppressing effect on water loss from the skin. As a result, the complex provides a body soap having high moisturizing effect and moisturizing feeling.