To provide a composition containing two or more thermoplastic resins excellent in mechanical properties, and a molding composed of the same.

A thermoplastic resin composition is obtained by blending 100 pts.wt. of a resin composition composed of two or more thermoplastic resins with 0.01 to 30 pts.wt. of a dendritic polyester containing at least one structural unit selected from an aromatic oxycarbonyl unit (P), an aromatic and/or an aliphatic dioxy unit (Q) and an aromatic dicarbonyl unit (R), and a tri- or more functional organic residue (B), and containing as its molecular terminal structure at least one selected from an unsaturated double bond, an epoxy group, a nitro group, a sulfonic acid group, a silyl group, a long-chain alkyl group having 8 or more carbon atoms, and a halogen atom.