A fluorescent molecular wire is provided, having a fluorescent polymer main chain to which an optically active substituent is linked so as to be conjugatable form, the optically active substituent being represented by formula (I) below: where R1 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; R2, R3, R4, R5, R6, R7, R8, and R9 represent independently a hydrogen atom, a linear alkyl group having 1 to 30 carbon atoms that may have a substituent, a branched alkyl group having 2 to 30 carbon atoms that may have a substituent, a cyclic alkyl group having 3 to 30 carbon atoms that may have a substituent, an aryl group having 6 to 30 carbon atoms that may have a substituent, or an aralkyl group having 7 to 30 carbon atoms that may have a substituent, and R3 and R7 may be bonded respectively to R4 and R8 to form an alkylene group having 2 to 60 carbon atoms that may have a substituent; and R10 and R11 represent independently a hydrogen atom or an alkyl group having 1 to 15 carbon atoms that may have a heteroatom, and R10 and R11 may be bonded to form an alkylene group having 2 to 30 carbon atoms that may have a heteroatom.