To provide a thermoplastic resin composition excellent in antibacterial and mechanical properties and also in the persistence of the antibacterial activ ity even after water washing or wiping with a dustcloth.

This composition comprises 99.9-70wt.% thermoplastic resin and 0.1-30wt.% ion complex comprising polyhexamethylenebiguanide and/or polyallylamine, an organic sulfonate having a long-chain alkyl and/or a polymer having a sulfonate structure.