PROBLEM TO BE SOLVED: To provide a polyglycerol fatty acid ester composition, a dynamic contact angle lowering agent and a surface tension depressant, exhibiting excellent retreat contact angle lowering effects in a food field, a cosmetic field, a pharmaceutical field and an industrial field.SOLUTION: A dynamic contact angle lowering agent or a surface tension depressant contains a polyglycerol fatty acid ester composition containing both (A) a polyglyceryl fatty acid ester obtained from saturated aliphatic acid having 8 to 12 carbon atoms and polyglycerol having an average degree of polymerization of 2 or more and less than 3, (B) a polyglyceryl fatty acid ester obtained from saturated aliphatic acid having 8 to 14 carbon atoms and polyglycerol having an average degree of polymerization of 3 to 12, and their mixture ratio (A)/(B) is 10 mass%/90 mass% to 90 mass%/10 mass% and its retreat contact angle immediately before a fall initiation of drops evaluated by using a retreat contact angle measuring apparatus
