A benzothienobenzothiophene derivative represented by general formula. In the formula, one of R 1 - and R 2 - is a group represented by below, and the other is a group represented by below. A group represented by general formula or: where Ar 1 represents an aromatic hydrocarbon group or heteroaromatic group which may have a substituent, Ar 2 represents an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent, and R' represents a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, or an aromatic hydrocarbon group or heteroaromatic group which may have a substituent. A group selected from an alkyl group having 2 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having a halogen atom and 2 to 20 carbon atoms, an alkoxyalkyl group having 3 to 20 carbon atoms, an alkylsulfanylalkyl group having 3 to 20 carbon atoms, an alkylaminoalkyl group having 3 to 20 carbon atoms, an aromatic hydrocarbon group or heteroaromatic group, and an aromatic hydrocarbon group or heteroaromatic group having, as a substituent, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having a halogen atom and 1 to 20 carbon atoms, an alkoxyalkyl group having 3 to 20 carbon atoms, an alkylsulfanylalkyl group having 3 to 20 carbon atoms, or an alkylaminoalkyl group having 3 to 20 carbon atoms; wherein any alkyl groups having 1 to 20 carbon atoms are linear, branched, or cyclic alkyl groups, any alkyl groups having 2 to 20 carbon atoms are linear, branched, or cyclic alkyl groups, any alkenyl groups having 2 to 20 carbon atoms are linear, branched, or cyclic alkenyl groups, any alkoxyalkyl groups having 3 to 20 carbon atoms are linear, branched, or cyclic alkoxyalkyl groups, any alkylsulfanylalkyl groups having 3 to 20 carbon atoms are linear, branched, or cyclic alkylsulfanylalkyl groups, and any alkylaminoalkyl groups having 3 to 20 carbon atoms are linear, branched, or cyclic N-alkylaminoalkyl groups. A group represented by general formula or: where Ar 1 represents an aromatic hydrocarbon group or heteroaromatic group which may have a substituent, Ar 2 represents an aromatic hydrocarbon group which may have a substituent or a heteroaromatic group which may have a substituent, and R' represents a hydrogen atom, a trialkylsilyl group having an alkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 20 carbon atoms, or an aromatic hydrocarbon group or heteroaromatic group which may have a substituent. A group selected from an alkyl group having 2 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having a halogen atom and 2 to 20 carbon atoms, an alkoxyalkyl group having 3 to 20 carbon atoms, an alkylsulfanylalkyl group having 3 to 20 carbon atoms, an alkylaminoalkyl group having 3 to 20 carbon atoms, an aromatic hydrocarbon group or heteroaromatic group, and an aromatic hydrocarbon group or heteroaromatic group having, as a substituent, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkyl group having a halogen atom and 1 to 20 carbon atoms, an alkoxyalkyl group having 3 to 20 carbon atoms, an alkylsulfanylalkyl group having 3 to 20 carbon atoms, or an alkylaminoalkyl group having 3 to 20 carbon atoms;