A soil erosion inhibitor is provided that includes resin powder excellent in moisture absorption resistance. According to the present invention, a soil erosion inhibitor is provided that includes redispersible synthetic resin powder having a bulk density of 0.50 g/mL or less.本發明提供一種包含耐吸濕性優異之樹脂粉末之土壤侵蝕防止劑。根據本發明,提供一種含有鬆密度為0.50g/mL以下之再乳化性之合成樹脂粉末之土壤侵蝕防止劑。