The mol-ecule of the title compound, C(27)H(22)N(4)O, assumes a non-planar conformation in which the pyrazolone ring forms dihedral angles of 12.73 (11), 65.17 (6) and 49.82 (6)°, respectively, with the two benzene rings and the naphthalene ring system. In the crystal, pairs of mol-ecules are linked by inter-molecular N-H⋯N hydrogen bonds, forming dimers. The secondary amino group is involved in an intra-molecular N-H⋯O hydrogen bond.