WE CLAIM:
1. A thermoplastic resin composition, comprising:
a graft copolymer (A) obtained by graft copolymerization of a monomer mixture (a) that includes at least an aromatic vinyl monomer (al) and a (meth)acrylate monomer (a2) but does not practically contain a vinyl cyanide monomer (a3), in the presence of a rubbery polymer (r) having a refractive index of not lower than 1.510 and not higher than 1.520; and
a vinyl copolymer (B) obtained by copolymerization of a monomer mixture (b) that includes at least an aromatic vinyl monomer (bl), a (meth)acrylate monomer (b2), and a vinyl cyanide monomer (b3), wherein
an acetone insoluble component (C) of the thermoplastic resin composition does not practically contain a vinyl cyanide monomer-derived unit,
an acetone soluble component (D) of the thermoplastic resin composition contains the vinyl cyanide monomer-derived unit, and
a content of the vinyl cyanide monomer-derived unit is not lower than 2% by mass and not higher than 20% by mass relative to 100% by mass of the acetone soluble component (D).
2. The thermoplastic resin composition according to claim 1,
wherein a dimethyl sulfoxide soluble component (E) of the
thermoplastic resin composition contains the vinyl cyanide monomer-derived unit, and
in the dimethyl sulfoxide soluble component (E), a rate of a triad having all positions occupied by the vinyl cyanide monomer-derived unit to a total number of triads having a center position occupied by the vinyl cyanide monomer-device unit is lower than 1%.
3. The thermoplastic resin composition according to either claim 1 or
claim 2,
wherein the rubbery polymer (r) is polybutadiene.
4. The thermoplastic resin composition according to any one of claims
lto3,
wherein the rubbery polymer (r) has a mass average particle size of

not less than 0.15 urn and not greater than 0.4 urn.
5. A manufacturing method of a thermoplastic resin composition,
comprising:
a process of obtaining a graft copolymer (A) by graft copolymerization of a monomer mixture (a) that includes at least an aromatic vinyl monomer (al) and a (meth)acrylate monomer (a2) but does not practically contain a vinyl cyanide monomer (a3), in the presence of a rubbery polymer (r) having a refractive index of not lower than 1.510 and not higher than 1.520;
a process of obtaining a vinyl copolymer (B) by copolymerization of a monomer mixture (b) that includes at least an aromatic vinyl monomer (bl), a (meth)acrylate monomer (b2), and a vinyl cyanide monomer (b3); and
a process of blending the graft copolymer (A) with the vinyl copolymer (B), wherein
an acetone insoluble component (C) of the thermoplastic resin composition does not practically contain a vinyl cyanide monomer-derived unit,
an acetone soluble component (D) of the thermoplastic resin composition contains the vinyl cyanide monomer-derived unit, and
a content of the vinyl cyanide monomer-derived unit is not lower than 2% by mass and not higher than 20% by mass relative to 100% by mass of the acetone soluble component (D).
6. The manufacturing method of the thermoplastic resin composition
according to claim 5,
wherein a dimethyl sulfoxide soluble component (E) of the thermoplastic resin composition contains the vinyl cyanide monomer-derived unit, and
in the dimethyl sulfoxide soluble component (E), a rate of a triad having all positions occupied by the vinyl cyanide monomer-derived unit to a total number of triads having a center position occupied by the vinyl cyanide monomer-device unit is lower than 1%.
7. The manufacturing method of the thermoplastic resin composition
according to either claim 5 or claim 6,
wherein the graft copolymer (A) is manufactured by an emulsion

polymerization method.
8. The manufacturing method of the thermoplastic resin composition
according to either claim 5 or claim 6,
wherein the vinyl copolymer (B) is manufactured by a continuous bulk polymerization method or by a continuous solution polymerization method.
9. A molded product obtained by molding the thermoplastic resin
composition according to any one of claims 1 to 4.
10. A manufacturing method of a molded product, comprising:
the manufacturing method of the thermoplastic resin composition according to any one of claims 5 to 8; and
a process of molding the thermoplastic resin composition to provide a molded product.