To notify that recording mediums having the same size and different kinds are contained and to easily identify a selectable recording medium by providing a recognition means for recognizing the kind of the medium contained in a recording medium holding means.

A recording medium holding guide is set to an optimum position according to a recording medium size in a recording medium special purpose recording medium holder 201 having permeability such as an OHT. A recording medium size recognition signal is sent from a recording medium size output unit to an engine controller 1002 as this operation is executed. Further, to recognize the holder 201, a transparent recording medium special purpose member 235 is installed. And, recording medium size detection output unit 236-1 to 236-3 are provided. When the kinds of recording media contained in the holders 201 to 204 are recognized by a CPU of an engine controller 1002, an LCD display of an operation panel 1003 is notified of the recognized kind.