To provide an optical parts precision molding compound consisting of a polyphenylene sulfide resin composition having good molding processability such as injection molding and also having high heat dissipation.

This polyphenylene sulfide resin composition for optical parts precision molding use is obtained by incorporating (a) 100 pts.wt. of a polyphenylene sulfide resin with (b) 50-300 pts.wt. of graphite 1-300 μm in mean particle size and (c) 20-300 pts.wt. of another inorganic filler, with the proviso that the total amount of components (b) and (c) is ≤400 pts.wt.