^Formula: di (hetero) aryl acetonitrile compound represented by CHAr ¹ Ar 2 CN (Ar ¹ and Ar ² represents a substituted or unsubstituted aromatic group.), ^Wherein: Ar ³ X ³ (Ar ³ is a substituted or .X ³ showing the unsubstituted aromatic group is a halogen atom. a halogenated aromatic compound represented by), is reacted in the presence of a palladium catalyst, a variety of tri (hetero) aryl acetonitrile the compound is synthesized. Di used as a substrate (hetero) aryl acetonitrile compound, a halogenated acetonitrile compound as a starting material can be synthesized in a two-step reaction. Therefore, a small step the various tri (hetero) aryl acetonitrile compound, can be easily synthesized.