The invention is to provide a talc-containing polypropylene resin composition by an in-line compounding, capable of solving a drawback where a reduced compression level for avoiding white spots caused by insufficient dispersion of inorganic filler increases the amount of involved air, thus detrimentally affecting the productivity particularly in case of a large-scale kneader, and a producing method therefor; namely a polypropylene resin composition including (A) a degassed-compressed talc which has a bulk specific gravity of from 0.3 to 1.0 and a compression rate of from 3.1 to 7.0, which is obtained by degassing and compressing talc having an average particle size of from 0.1 to 12 μm and a bulk specific gravity of from 0.1 to 0.5, and which contains a component of 1,000 μm or larger, when sieved by a ro-tap method, in a content of 15 wt % or less, and (B) a polypropylene resin, and a producing method therefor.