A process for producing a pelletized or molded article of a polypropylene-based resin composition comprising the steps of: melt-kneading the following components, and:: propylene homopolymer having an MFR of 10g/10 minutes or more and isotactic pentad fraction of 98.0% or more, and/or propylene block copolymer having an MFR of 30g/10 minutes or more and composed of a propylene homopolymer portion and copolymer portion of propylene and another α-olefin, the propylene homopolymer portion having an isotactic pentad fraction of 98% or more, and the copolymer portion containing propylene at 30 to 85% by weight and having a weight-average molecular weight of 400,000 or more: 10% by weight or more but less than 94.5% by weight,: at least one species of inorganic filler selected from the group consisting of talc, calcium carbonate, natural mica, synthetic mica, wollastonite and montmorillonite, having an average particle size of 10μm or less, determined by laser diffractometry: more than 0% by weight but 30% by weight or less, and: ethylene- and/or styrene-based elastomers having an MFR of 0.1 to 20g/10 minutes and density of 0.850 to 0.910g/cm 3: 5 to 50% by weight, supplying carbon fibers as the following component:: carbon fibers having a fiber diameter of 2 to 15μm and fiber length of 0.1 to 20mm: 0.5 to 20% by weight, through a side feeder into the components, and being molten and kneaded to disperse the carbon fibers and control the breaking of the carbon fibers to an average length of 0.05mm or more but below 20mm, and extruding the resulting polypropylene-based resin composition into pellets or a molded shape. melt-kneading the following components, and:: propylene homopolymer having an MFR of 10g/10 minutes or more and isotactic pentad fraction of 98.0% or more, and/or propylene block copolymer having an MFR of 30g/10 minutes or more and composed of a propylene homopolymer portion and copolymer portion of propylene and another α-olefin, the propylene homopolymer portion having an isotactic pentad fraction of 98% or more, and the copolymer portion containing propylene at 30 to 85% by weight and having a weight-average molecular weight of 400,000 or more: 10% by weight or more but less than 94.5% by weight,: at least one species of inorganic filler selected from the group consisting of talc, calcium carbonate, natural mica, synthetic mica, wollastonite and montmorillonite, having an average particle size of 10μm or less, determined by laser diffractometry: more than 0% by weight but 30% by weight or less, and: ethylene- and/or styrene-based elastomers having an MFR of 0.1 to 20g/10 minutes and density of 0.850 to 0.910g/cm 3: 5 to 50% by weight, supplying carbon fibers as the following component:: carbon fibers having a fiber diameter of 2 to 15μm and fiber length of 0.1 to 20mm: 0.5 to 20% by weight,: propylene homopolymer having an MFR of 10g/10 minutes or more and isotactic pentad fraction of 98.0% or more, and/or propylene block copolymer having an MFR of 30g/10 minutes or more and composed of a propylene homopolymer portion and copolymer portion of propylene and another α-olefin, the propylene homopolymer portion having an isotactic pentad fraction of 98% or more, and the copolymer portion containing propylene at 30 to 85% by weight and having a weight-average molecular weight of 400,000 or more: 10% by weight or more but less than 94.5% by weight,: at least one species of inorganic filler selected from the group consisting of talc, calcium carbonate, natural mica, synthetic mica, wollastonite and montmorillonite, having an average particle size of 10μm or less, determined by laser diffractometry: more than 0% by weight but 30% by weight or less, and: ethylene- and/or styrene-based elastomers having an MFR of 0.1 to 20g/10 minutes and density of 0.850 to 0.910g/cm 3: 5 to 50% by weight, supplying carbon fibers as the following component:: carbon fibers having a fiber diameter of 2 to 15μm and fiber length of 0.1 to 20mm: 0.5 to 20% by weight, through a side feeder into the components, and being molten and kneaded to disperse the carbon fibers and control the breaking of the carbon fibers to an average length of 0.05mm or more but below 20mm, and extruding the resulting polypropylene-based resin composition into pellets or a molded shape.