The flame retardant composition and flame retardant resin composition

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A flame retardant composition containing a nitrilotris(methylene)phosphonic acid metallic salt produced by reacting nitrilotris(methylene)phosphonic acid represented by the following general formula (1) and a salt thereof with a divalent metallic compound is provided. (wherein M and M represent a hydrogen atom or an alkaline-earth metal) The composition according to the present invention has smoke suppression properties, emits no irritating odor, and can impart superior flame retardancy to various resins while maintaining the inherent mechanical properties of the resins.