The invention relates to a polycarbonate resin composition having good durability even in high-moisture atmospheres, and to a flame-retardant polycarbonate resin composition in which the flame retardants adheres little to molds while the resin composition is molded. The polycarbonate resin composition comprises (A) a polycarbonate resin and (B) an inorganic filler, and contains (C) an arylphosphine and optionally (D) a flame retardant.