The photochemical synthesis of Ag(0) nanoparticles in the presence of amino- and carboxylate-terminated PAMAM dendrimers is reported. The formation of Ag(O) nanoparticles was followed spectrophotometrically and by transmission electron microscopy (TEM). According to TEM investigations Ag(O) nanoparticles with the average size of about 7 mm in diameter were produced. Based on the present investigation a possible mechanism for the Ag(O) nanoparticles formation is proposed.