An electrically conductive resin composition comprising15-35 parts by weight of a cyanate ester compound which is a monomer, polymer thereof or mixture of monomer and polymer, wherein said monomer has the formula R--O--C.tbd.N)m wherein m is an integer of 2-10 and R is an aromatic organic group, the cyanate groups being bonded to said aromatic organic group, and 65-85 parts by weight of an electri