A glass-fiber-reinforced polypropylene resin composition is provided having:(A) at least one polypropylene resin,(B) resin-coated glass fiber obtained by previous coating glass fiber with a thermoplastic resin, and(C) glass fiber, whereinthe total content of the resins in the components (A) and (B), respectively, being 65 to 95% by weight based on the total weight of the components (A), (B) and (C),the total content (G) of the glass fibers in the components (B) and (C) being 5 to 35% by weight based on the total weight of the components (A), (B) and (C), andthe melt flow rate M (g/10 min) of the polypropylene resin as component (A) and the above-mentioned total glass fiber content G (% by weight) satisfies the relationship:M