| 摘要 |
A sheet feed tray including a regulating wall member being assembled in a displaceable manner with a placing tray, which includes a first tray side engagement portion, and regulating a position of a recording medium such that a wall portion of the regulating wall member contacts with the end portion of the recording medium, a first engagement member being disposed in the regulating wall member and including a first regulating wall member side engagement portion, the first regulating wall member engaging with the first tray side engagement portion regulates a displacement of the regulating wall member, an elastic unit being elastically deformable and generating 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 regulating a deformation amount of the elastic unit, and releasing operation unit releasing the engaging state.
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