Abstract: Provided is a polycarbonate resin composition containing, relative to (A) a polycarbonate resin (component A), (B) a triarylphosphine (component B) represented by the following formula [1], and this resin composition is characterized by undergoing less discoloration when exposed to a high-temperature environment for a long period of time and having excellent thermal stability. [In the formula, R2-1, R2-2, R2-3, R6-1, R6-2, R6-3, R0-1, R0-2, and R0-3 are each a hydrogen atom, a hydrocarbon group, an alkoxy group, or a halogen and may be the same or different from each other, with the proviso that at least one of R2-1, R2-2, R2-3, R6-1, R6-2, and R6-3 is a hydrocarbon group, an alkoxy group, or a halogen, and p, q, and r are each an integer of 0 to 3.