Image forming apparatus

An image forming apparatus, comprising:

• a manual feed tray on which a recording material is to be manually stacked;
• a first detecting unit configured to detect presence or absence of the recording material on the manual feed tray;
• a second detecting unit arranged on an upstream side of the first detecting unit in a conveyance direction of the recording material, the second detecting unit configured to detect presence or absence of the recording material on the manual feed tray;
• a third detecting unit arranged on an upstream side of the second detecting unit in the conveyance direction, the third detecting unit configured to detect presence or absence of the recording material on the manual feed tray;
• a fourth detecting unit configured to detect a length of the recording material on the manual feed tray in a direction orthogonal to the conveyance direction;
• a display portion configured to display information;
• and
• a control portion configured to determine a size of the recording material based on detection results of the first detecting unit, the second detecting unit, the third detecting unit and the fourth detecting unit, and control portion causing the display portion to display a first screen displaying the determined size of the recording material,
• wherein the control portion causes the display portion to display a second screen for designating the size of the recording material, when, among the first detecting unit, the second detecting unit and the third detecting unit, a detecting unit located on a downstream side in the conveyance direction does not detect the presence of the recording material and another detecting unit located on an upstream side of the detecting unit in the conveyance direction, which does not detect the presence of the recording material, detects the presence of the recording material.