The present invention provides a gel forming agent that the preparation is simple and the gel forming agent combines all the advantages such as high safety against living bodies or environment, good gel-forming ability, excellent usability and good handling property. The gel forming agent is characterized in blending 30~150 parts by weight of polyglycerol fatty acid ester relative to 100 parts by weight of lecithin wherein the polyglycerol fatty acid ester has fatty acid residues having a carbon number of 14 or less, HLB calculated by an organic conceptual diagram is 15 or more and the degree of polymerization of glycerol units is 8~40.本發明提供一種膠形成劑,其製備簡便,兼具對於生物或環境之高安全性、良好的膠形成能力、優異的使用感、良好的處理性。本發明提供一種膠形成劑,其特徵在於:相對於卵磷脂100重量份,係摻合聚甘油脂肪酸酯30~150重量份;該聚甘油脂肪酸酯具有碳數為14以下的脂肪酸殘基,以有機示意圖算出的HLB為15以上,且甘油單元的聚合度為8~40。
