In a transfer printing film roll comprising a bobbin, and a transfer printing film wound around the bobbin, the inner trailing end of the transfer printing film is bonded to the bobbin over the width of the film so strongly as to prevent separation of the film from the bobbin due to the force of a feed motor for paying out the film even when the film has been paid out completely from the bobbin. Because of the strong bonding made over the width of the film, the film can be wound around the bobbin with a uniform distribution of tension and without offset of the side edges of the film wound over each other. When the film has been paid out completely to the trailing end, tension on the film increases so that the load on the feed motor also increases. The increased load can be utilized to detect the end of the film. This eliminates the need of an "END" mark applied to the trailing end of the film for detecting the end of the film.