Resin composition, molded article, electromagnetic wave absorber, and method for measuring absorptivity of resin composition

Provided are: a resin composition which has a high electromagnetic wave absorption rate and low electromagnetic wave transmittance and reflectance, and which has a small difference in reflectance due to a difference in frequency of electromagnetic waves; also provided are a molded body and an electromagnetic wave absorber. The resin composition contains 0.1-10.0 parts by mass of carbon nanotubes and 10-100 parts by mass of glass fibers per 100 parts by mass of a thermoplastic resin, and the mass ratio of the carbon nanotubes to the glass fibers (carbon nanotubes/glass fibers) is 0.01-0.30. 提供一种树脂组合物，其是电磁波的吸收率高且电磁波的透射率和反射率低的树脂组合物，其中，电磁波的频率差异导致的反射率之差小；并且提供成型体和电磁波吸收体。一种树脂组合物，相对于热塑性树脂100质量份，包含碳纳米管0.1～10.0质量份和玻璃纤维10～100质量份，碳纳米管与玻璃纤维的质量比例(碳纳米管/玻璃纤维)为0.01～0.30。