To provide a thermoplastic resin composition which solves the problems with tourmaline and, when molded, gives a molded article persistently generating negative ions even in a static state.

This resin composition is prepared by mixing and dispersing 0.1-230 pts.wt. negative ion ceramics powder into 100 pts.wt. thermoplastic resin. Preferably, the negative ion ceramics powder mainly comprises 40-50% zirconium oxide, 25-30% silicon oxide, and 2-8% phosphoric anhydride and contains a natural radioactive element.