To provide a resin composition having a good compression moldability.
The resin composition contains: a resin-impregnated fiber bundle prepared by impregnating and integrating 100 parts by mass of a bundle of a fiber material (A) with 25 to 300 parts by mass of a thermoplastic resin (B); and a lubricant (C), wherein: the resin-impregnated fiber bundle has a flat shape with a widthwise cross-sectional shape having a major axis and a minor axis (length of the major axis> length of the minor axis); the major axis has an average length (d1) of 0.5 to 4.0 mm; an average flatness ratio (d1/d2) determined from the average length (d1) of the major axis and an average length (d2) of the minor axis is 1.0 to 8.0; the resin-impregnated fiber bundle has a length (L) of 3 to 50 mm; a ratio (L/d1) between the L and the d1 is 10 to 50; the lubricant is contained in an amount of 0.001 to 0.05 parts by mass relative to 100 parts by mass of the resin-impregnated fiber bundle; and the resin composition has a bulk density of 0.1 to 0.4 g/cm 3 .