Conductive composition

Provided is a conductive composition which has good shielding properties against electromagnetic waves of 100 MHz to 1 GHz, and which has excellent filling properties into a trench portion formed in a filling resin. This conductive composition contains 400-600 parts by mass of a conductive filler per 100 parts by mass of an epoxy resin containing 5-20 parts by mass of a dimer acid-type epoxy resin, and the conductive filler contains a conductive filler (A) having an average particle diameter (D50) of 5-8 [mu] m and a conductive filler (B) having an average particle diameter (D50) of 2-3 [mu] m as measured by a laser diffraction scattering particle size distribution measurement method. The mass ratio of the content ratio ((A): (B)) of the conductive filler (A) and the conductive filler (B) is 97: 3 to 50: 50. 本发明提供一种针对100MHz～1GHz电磁波具有良好的屏蔽性，且向形成于填充树脂的沟槽部的填充性优越的导电性组合物。本发明导电性组合物中，相对于含有5～20质量份二聚酸型环氧树脂的100质量份环氧树脂，含有400～600质量份导电性填料，上述导电性填料含有通过激光衍射散射粒度分布测定法测定出的平均粒径（D50）5～8μm的导电性填料（A）以及平均粒径（D50）2～3μm的导电性填料（B），上述导电性填料