The present invention provides a thermoplastic resin composition including specific amounts of (A) a polypropylene resin, (B) an elastomer, (C) inorganic filler, (D) a resin having a melt tension of 0.1 N or more and a swelling ratio of 1.8 or more and being characterized by that the time required for the resin until the ratio (G(t)/G(0.02)) of a relaxation modulus G(t) measured at 210.degree. C. to a relaxation modulus G(0.02) at a time of 0.02 sec reaches 0.01 is 10 sec or more, and (E) a resin characterized by that, with respect to a swelling ratio measured at 220.degree. C. at an L/D of an orifice of 40, the ratio of a swelling ratio (SR10.sup.3) at a shear rate of 2.4.times.10.sup.3 sec.sup.-1 to a swelling ratio (SR10.sup.2) at a shear rate of 1.2.times.10.sup.2 sec.sup.-1, SR10.sup.3/SR10.sup.2, is from 1.0 to 1.1.