[Problem] To provide a novel fluorescent probe for dipeptidyl peptidase IV, and a detection method and a detection kit using the fluorescent probe. [Solution] A fluorescent probe for detecting dipeptidyl peptidase IV (DPP-IV), said probe comprising a compound represented by formula (I) or a salt thereof. In formula (I): A and B are either the same or different and independently represent an amino acid residue, provided that A is bonded via an amide bond to NH in an adjacent formula and B is bonded via an amide bond to A； R 1 represents hydrogen atom(s) or 1 to 4 substituents bonded to the benzene ring, said substituents being either the same or different； R 2 , R 3 , R 4 , R 5 , R 6 and R 7 independently represent a hydrogen atom, a hydroxyl group, an alkyl group or a halogen atom； R 8 and R 9 independently represent a hydrogen atom or an alkyl group； and X represents a C 1 -C 3 alkylene group.
