Patent ID: 7712988

Claim:
A sheet feed tray for an image forming apparatus, comprising: a placing tray including a placing portion, on which a recording medium is placed, and a first tray side engagement portion; a regulating wall member which is assembled in a displaceable manner with the placing tray and regulates a position of the recording medium such that a wall portion of the regulating wall member contacts with an end portion of the recording medium; a first engagement member which is disposed on the regulating wall member and includes a first regulating wall member side engagement portion, the first regulating wall member side engagement portion engaging with the first tray side engagement portion and regulating displacement of the regulating wall member; an elastic unit which is elastically deformable and generates a force for holding an engaging state between the first tray side engagement portion and the first regulating wall member side engagement portion; an elastic deformation regulating unit which regulates a deformation amount of the elastic unit; a releasing operation unit which releases the engaging state between the first tray side engagement portion and the first regulating wall member side engagement portion; and a second engagement member which is disposed on the regulating wall member and includes a second regulating wall member side engagement portion, the second regulating wall member side engagement portion engaging with a second tray side engagement portion disposed on the placing tray, wherein an elastic deformation portion which is elastically deformable and constitutes the elastic unit is provided in at least a part of the second engagement member, wherein the second regulating wall member side engagement portion is pushed onto the second tray side engagement portion by a reaction force of an elastic force of the elastic unit in pushing the first regulating wall member side engagement portion to the first tray side engagement portion, and wherein, when the releasing operation unit is operated, the first regulating wall member side engagement portion is displaced in a direction to increase the deformation of the elastic unit and releases the engaging state between the first tray side engagement portion and the first regulating wall member side engagement portion.