Patent ID: 8128084

Claim:
An image forming apparatus, comprising: a sheet feeding cassette removably mounted to an apparatus main body, and configured to contain sheets; a sheet feeding member configured to feed a sheet from the sheet feeding cassette; and an image forming portion configured to form an image on the sheet fed out from the sheet feeding member, wherein the sheet feeding cassette comprises: a regulation portion slidably provided in a cassette body, and configured to regulate a position of the sheet at a position according to a size of the sheet contained in the cassette body; and a fixation mechanism configured to fix the regulation portion, and wherein the fixation mechanism comprises: a tooth row provided on the cassette body along a sliding movement direction of the regulation portion; a holding member swingably supported to the regulation portion to be engaged with the tooth row, wherein a clearance is provided between the holding member and the regulation portion at a swing support portion of the holding member, and the regulation portion and the holding member are relatively movable in the sliding movement direction of the regulation portion in the clearance; and a stopper portion provided to the regulation portion to be contactable to the holding member, the regulation portion being moved in the sliding movement direction and the stopper portion regulating a swing movement of the holding member by contacting the holding member when a force in the sliding movement direction is applied to the regulation portion.