Provided is a skin barrier enhancer capable of enhancing skin barrier function. A skin barrier enhancer containing at least one of a monosaccharide and a sugar alcohol and having a pH of 4.0 or more and 7.0 or less.本發明提供一種可增強皮膚屏障機能之皮膚屏障增強劑。即,一種皮膚屏障增強劑,含有單醣及糖醇中之至少一者,且pH為4.0以上且7.0以下。