To provide a method for stably manufacturing a desired polyamide resin composition in obtaining the polyamide resin composition from melt- kneading two or more polyamides.

A method for manufacturing a polyamide resin composition obtained from melt-kneading two or more polyamide resins is the one wherein at least one or more of the two or more polyamide resins comprise 0.001-0.5 pts.wt. of an inorganic phosphorus compound as a phosphorus atom to 100 pts.wt. of the two or more polyamide resins in total, and when melt-kneading the two or more polyamide resins, at least one selected from inorganic acid salts of the first or second family metals in the periodic table of elements is made to exist in 1-50 mole equivalents to the total phosphorus atoms of the inorganic phosphorus compound and in not more than 200×10-4 mol/100 g to the two or more polyamide resins in total.