PURPOSE: To provide a paper discharge tray movably in a paper feed cassette without worsening a paper feed cassette essential function such that advancing foreign matter into a cassette main unit is prevented to avoid an influence of humidity in the periphery.

CONSTITUTION: In an image forming device capable of mounting/demounting a paper feed cassette 20, comprising a vessel main unit 21 capable of receiving recording paper loaded to have an opening part in the upper part and a fixed cover 27 covering at least partly this opening part, from an operation front surface side of the image forming device also to provide a paper discharge part positioned inside the operation front surface side in the upward of the paper feed cassette 20, a paper discharge tray 28 is movably received in a lower or upper surface side of the fixed cover 27 of the paper feed cassette 20 in the upward of the opening part of the vessel main unit 21. In the paper feed cassette of the image forming device, when the recording paper is discharged from the paper discharge part, the paper discharge tray 28 is drawn out to a front side from the paper feed cassette 20, and discharge recording paper P can be loaded on the paper discharge tray 28.