PURPOSE: To shorten the time required for exchanging a cartridge, to rapidly eject and load the cartridge, to realize the rapid retrieval and the copying of a microfilm, further to facilitate jamming processing and to make the cartridge loader reasonable in cost.

CONSTITUTION: The loading path B of the cartridge A for the supply part 6 of the roll film carrier 1 of a reader printer, etc., and the ejecting path C of the cartridge A already used from the supply part 6 are individually formed so that they may not overlapped. The front surface part 38 of the supply part 6 corresponding to the loading path B is opened and closed to load and position the cartridge A. Then, the ejection and the loading of the cartridge A are executed nearly in parallel and at the same time. In the case of jamming, the front surface part 38 is opened to perform the jamming processing.