A rare-earth fluorescent complex which forms a fluorescent complex with two or more rare-earth metals such as europium and terbium and can effectively be excited at a wavelength of 340 nm or longer; a fluorescent labeling agent comprising the rare-earth fluorescent complex; a method of fluorescent labeling in which the rare-earth fluorescent complex is used as a labeling agent; and a method of fluorometric analysis in which the fluorescent labeling agent is used. The rare-earth fluorescent complex is characterized by having a cyclic ligand comprising a 4-biphenyl-2,2′:6′,2″-terpyridine skeleton and a 2,6-bis(3′-aminomethyl-1′-pyrazolyl)pyrazine skeleton bonded thereto.