To obtain the subject resin composition highly balanced between flowability and impact resistance, slight in the deterioration of its mechanical properties even under high-temperature/high-humidity conditions and even when subjected to a high-temperature molding process, and good in color tone.

This flame-retardant resin composition is obtained by incorporating a total of 100 pts.wt. of (A) 60-95 pts.wt. of a polycarbonate with a weight- average molecular weight of 17,000-23,000, (B) 40-0 pt(s).wt. of a styrene-based copolymer and (C) 5-20 pts.wt. of two kinds of specific graft rubbers mutually compounded at specific proportions, with (D) 5-20 pts.wt. of an organophosphorus compound ≤0.1 mgKOH/g in acid value and (E) 0.01-1 pt.wt. of zeolite.