Binding of poly(amido amine) dendrimer on sodium poly-(L)-glutamate (NaPGA) in aqueous solutions of 0.01 and 0.1 M NaCl has been investigated by static light scattering. It was observed that the weight-average molecular weight and the radius of gyration increase sharply, when a certain molar ratio of dendrimer to NaPGA, N-den/N-PGA, was reached. The experimental results were simulated by using a model in which there was an equilibrium between dendrimers associated with NaPGA and those in solutions. The so-formed dendrimer-NaPGA complexes form aggregates in solutions through dendrimer junctions. The texture of such aggregates was observed by transmission electron microscopy. The aggregates bear a globular structure, the dimension of which was larger than that of a single NaPGA.