A method and an apparatus for producing a stamper capable of producing in a high yield a stamper for producing a high quality optical disk. According to the conventional production technology of stampers, primary tin ions in a sensitizer containing the tin ions used for electric conduction treatment of a substrate surface are readily oxidized by dissolved oxygen and cause defects during the production of stampers. Therefore, even when a production apparatus is automated, substantially daily maintenance is necessary so as to keep satisfactory yield. The present invention carries out the electric conduction treatment of the substrate surface by treating the substrate surface by a treating solution containing a compound having a betaine structure and a polyoxyethylenealkylamine compound, then treating it by a colloidal solution containing tin and palladium and further conducting electroless plating. In this way, the present invention makes the maintenance work easier in an automated process and makes it possible to produce a high quality stamper with a high production yield.