The present invention has an object to provide a tin-plated film and a method for producing the same, capable of preventing whiskers from being generated and simultaneously preventing the surface of a substrate to be plated, which is not covered with a tin-plated film, from discoloring due to oxidation, by which prevention of whisker generation, suppression of whisker growth, and prevention of discoloring of a substrate to be plated are compatible with simplified operations ensuring excellent productivity. The method is provided with the steps of removing a part of a tin-plated film formed on copper or copper alloy; processing to prevent discoloring of the copper or copper alloy from which the tin-plated film is removed; and applying heat energy to the tin-plated film of the copper or copper alloy which is processed to prevent discoloring.