Solvent extraction of silver using 5,5-Diphenyl-2,4-Imidazolidinedione as an extractant is investigated. It is found that the distribution ratio was second order dependent on both of extractant and silver ( I ) ion concentration as well as inversely dependent on hydrogen ion, suggesting that silver ( I ) ion is extracted as binuclear complex, Ag2R2. The extraction equilibrium constant K is evaluated as 2.0 x 10(-5)[dm(3)/mol]. Stripping of loaded silver is nearly completely accomplished by 0.1 mol/dm(3)-nitric acid. Silver was selectively extracted over thallium(I), nickel(II), copper(II), and even over pal ladium(II).