A thermoplastic resin composition which comprises a thermoplastic resin and a graft copolymer obtained by polymerizing 10 to 70 parts by weight of one or more monomers consisting of 60 to 100 wt.% at least one vinyl monomer selected from the group consisting of (meth)acrylic ester compounds, aromatic vinyls, and vinyl cyanide compounds and 0 to 40 wt.% other copolymerizable monomer(s) in the presence of 30 to 90 parts by weight of hollow rubber particles which are a rubber obtained by polymerizing one or more polymerizable ingredients comprising butadiene without using a crosslinking agent and have a porosity as measured in a latex state of 3 to 90% (100 parts by weight in total).
