The present invention provides a polyamide resin composition comprising a polyamide resin (A), a melamine cyanurate-based flame retardant (B) and a surfactant (C), wherein the polyamide resin composition comprises 100 parts by mass of the total of 60 to 75% by mass of the polyamide resin (A) comprising at least one or more polyamide resin (A1) having a melting point of 255 to 270° C. and 25 to 40% by mass of the melamine cyanurate-based flame retardant (B), and 0.1 to 1.0 part by mass of the surfactant (C) comprising at least one or more fatty acid ester of a polyalkylene polyhydric alcohol, and wherein the melamine cyanurate-based flame retardant (B) dispersed in the polyamide resin composition has an average dispersion particle diameter of 1 to 20 μm.