Abstract: A fluorescent compound or a salt thereof represented by General Formulae (I) or (II) shown below: In the General Formulae (1) and (II) shown above, R1 and R11 represent an alkyl group or an ?-aminoalkyl group, R2 and R12 represent a hydrogen atom or a alkyl group, R3 and R13 represent an atomic group represented by a formula —(CH2)m— (m is a natural number of 10 or less), R4 and R14 represent an atomic group represented by a formula —CH2— or —NR6— (—NR16—) (R6 and R16 represent an alkyl group), R5 and R15 represent an atomic group represented by a formula —(CH2)n— (n is a natural number of or less), R represents an atomic group represented by any one of formulae —NH2, —NHR7—, NR7R8 and —NR7R8R9 (—NHR17, —NR17R18 and —N+R17R18R19) (R7, R8, R9, R17, R18 and R19 independently represents an alkyl group, respectively) and when R2 and R12 are alkyl groups and R4 (R14) is an atomic group represented by the formula —NR6—(—NR16—), R2 and R6 and R12 and R16 may bind with each other to form a ring.