Proposed is a method for collecting valuable metal from an ITO scrap by subjecting the ITO scrap to electrolysis and collecting the result as metallic indium. Specifically, the present invention proposes a method for selectively collecting metallic indium including the steps of subjecting the ITO scrap to electrolysis in an electrolytic bath partitioned with a diaphragm or an ion-exchange membrane, subsequently extracting anolyte temporarily, eliminating tin contained in the anolyte by a neutralization method, a replacement method or other methods, placing a solution from which the tin was eliminated in a cathode side again and performing electrolysis thereto; or a method for collecting valuable metal from an ITO scrap including the steps of obtaining a solution of In or Sn in an ITO electrolytic bath, eliminating the Sn in the solution, and collecting In in the collecting bath. These methods enable the efficient collection of metallic indium from an ITO scrap of an indium-tin oxide (ITO) sputtering target or an ITO scrap such as ITO mill ends arisen during the manufacture of such ITO sputtering target.