To provide a production method for a conjugated aromatic compound.

This production method for the conjugated aromatic compound is a method of carrying out a coupling reaction of an aromatic compound (a) or (b) under the coexistence of a bivalent nickel compound, a nitrogen containing bidentate ligand and manganese. The aromatic compound (a) is an aromatic compound (A) of which the aromatic ring is coupled with one or two of leaving groups, and the same aromatic compound. The aromatic compound (b) is the aromatic compound (A) of which the aromatic ring is coupled with one or two of the leaving groups, and an aromatic compound (B) different from the aromatic compound (A) of which the aromatic ring is coupled with one or two of the leaving groups.