Disclosed is a flame retardant composition containing (A) an amine phosphate and (B) a zinc glycerolate. It is preferred that component (A) contain an amine pyrophosphate and that the mass ratio of component (A) to component (B) be 99.99:0.01 to 60:40. The flame retardant composition preferably further contains (C) zinc oxide, wherein the content of component (C) is 0.01 to 10 parts by mass per 100 parts by mass of the sum of components (A) and (B). The flame retardant composition preferably further contains (D) hydrotalcite, wherein the content of component (D) is 0.01 to 5 parts by mass per 100 parts by mass of the sum of components (A) and (B).