Thermoplastic resin composition and method for producing thermoplastic resin composition

A method for producing a thermoplastic resin composition, comprising:

• a mixing step of obtaining a first mixture by kneading a thermoplastic resin, carbon nanotubes, and carbon fibers at a first temperature;
• a temperature lowering step of adjusting the temperature of the first mixture to a second temperature;
• and
• a low-temperature kneading step of kneading the first mixture at the second temperature, wherein
• the first temperature is a temperature higher than the second temperature, and
• the second temperature is a range of temperature from a processing region expressing temperature in a storage modulus of the thermoplastic resin composition at around the melting point (Tm° C.) of the thermoplastic resin to a temperature which is 1.06 times (T3° C.×1.06) a plateau region expressing temperature (T3° C.) in the storage modulus.