Provided is a polyamide elastomer composition having excellent stability in various molding and excellent dyeing properties as well as excellent color fastness properties. A polyamide elastomer composition which comprises a polyamide elastomer and a phosphorous acid compound, wherein the polyamide elastomer comprises constituent units 1 derived from a diamine compound represented by the formula (1) below, constituent units 2 derived from an aminocarboxylic acid compound represented by the formula (2) below or a lactam compound represented by the formula (3) below, and constituent units 3 derived from a dicarboxylic acid compound represented by the formula (4) below, wherein the content of the phosphorous acid compound in the polyamide elastomer is 0.02 to 0.15% by mass, and wherein the polyamide elastomer has a terminal amino group concentration of 2.0×10−5 eq/g or more (x represents an integer of 1 to 20, y represents an integer of 4 to 50, z represents an integer of 1 to 20, R1 represents a linking group comprising a hydrocarbon chain, R2 represents a linking group comprising a hydrocarbon chain, R3 represents a linking group comprising a hydrocarbon chain, and m represents 0 or 1).