To provide a thermoplastic resin composition having a desired, electrical conductivity (volume specific resistivity) with a narrow fluctuation in a semi-electrical conductivity region and to provide a preparing process therefor.

This thermoplastic resin composition comprises a matrix phase containing a thermoplastic resin (A) and a domain phase containing both a thermoplastic resin (B) and an electrical conductivity-imparting agent (C), with the surface tension difference (γB-γA) between a surface tension γA of the resin (A) and that γB of the resin (B) being 1 or more, and has a volume specific resistivity of 104 to 1012 [Ω.cm].