Patent ID: 8131201

Claim:
An image forming apparatus comprising: an image forming portion which forms an image on a paper sheet; an apparatus main body which includes a first side wall and a second side wall opposite to the first side wall, and accommodates the image forming portion therein; a paper feeding cassette which is detachably mountable to the apparatus main body, adapted to selectively store first paper sheets having a first size in a paper feeding direction and second paper sheets having a second size larger than the first size, and feeds a paper sheet from an end of the first side wall toward the image forming portion in a state that the paper feeding cassette is mounted to the apparatus main body; a paper feeding tray which is disposed at the second side wall of the apparatus main body, and stores third paper sheets; and a structural member which has a mechanism for feeding the third paper sheets loaded on the paper feeding tray toward the image forming portion, wherein the paper feeding cassette being arranged such that heights of the paper sheets stored in the paper feeding cassette are set in such a manner that the height of the second paper sheets is lower than the height of the first paper sheets, and the structural member is disposed in a space, on a side of the second side wall, defined by a difference in the heights.