PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having transparency, low hygroscopicity, heat resistance and moldability by a material extrusion type three-dimensional printer, and a filament thereof. A thermoplastic resin composition containing a cyclic polymer (A) and a hydrocarbon-based rubber softening agent (B), wherein the cyclic polymer (A) is at least one aromatic vinyl monomer unit. And a hydrocarbon block copolymer which is a hydride of a block polymer containing at least one conjugated diene monomer unit, the hydride block copolymer is a hydride of a polymer block consisting of an aromatic vinyl monomer unit. It has a group vinyl polymer block unit and a hydrocarbonated conjugated diene polymer block unit which is a hydride of the polymer block consisting of a conjugated diene monomer unit, and the hydride block copolymer has at least two hydride aromatic vinyl polymer block units. A thermoplastic resin composition having at least one hydrocarbon-conjugated diene polymer block unit is used. [Selection diagram] None
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