An image forming apparatus comprising: an ejection tray having a sheet stacking face on which an ejected sheet is stacked; a storage part formed in the sheet stacking face; and a stopper member which has a base end part and a main part extending from the base end part toward a distal end of the stopper member, provided in the storage part turnably around a proximal end of the stopper member in upstream and downstream sides in a sheet ejection direction, the stopper member being selectively supported either in a storage posture stored in the storage part to form a part of the sheet stacking face by turning in the upstream side or a restriction posture to prevent the sheet from falling down from the sheet stacking face by turning in the downstream side, wherein the storage part includes a first recess; and a second recess connected to an end on the downstream side of the first recess with a step and having a depth deeper than a depth of the first recess, the base end part of the stopper member supported in the second recess so as to be movable upward and downward and turnable; and the main part of the stopper member extending from the pressed part toward a distal end of the stopper member and supported in the first recess in the storage posture, characterized in that: when the base end part is pressed downward in the storage posture, the base end part is moved downward in the second recess and a lower face of the main part comes into contact with an edge on the downstream side of the first recess, the stopper member is turned around the edge into a protrusion posture where the distal end protrudes above the sheet stacking face. an ejection tray having a sheet stacking face on which an ejected sheet is stacked; a storage part formed in the sheet stacking face; and a stopper member which has a base end part and a main part extending from the base end part toward a distal end of the stopper member, provided in the storage part turnably around a proximal end of the stopper member in upstream and downstream sides in a sheet ejection direction, the stopper member being selectively supported either in a storage posture stored in the storage part to form a part of the sheet stacking face by turning in the upstream side or a restriction posture to prevent the sheet from falling down from the sheet stacking face by turning in the downstream side, wherein the storage part includes a first recess; and a second recess connected to an end on the downstream side of the first recess with a step and having a depth deeper than a depth of the first recess, the base end part of the stopper member supported in the second recess so as to be movable upward and downward and turnable; and the main part of the stopper member extending from the pressed part toward a distal end of the stopper member and supported in the first recess in the storage posture, characterized in that: a first recess; and a second recess connected to an end on the downstream side of the first recess with a step and having a depth deeper than a depth of the first recess, the base end part of the stopper member supported in the second recess so as to be movable upward and downward and turnable; and the main part of the stopper member extending from the pressed part toward a distal end of the stopper member and supported in the first recess in the storage posture, characterized in that: when the base end part is pressed downward in the storage posture, the base end part is moved downward in the second recess and a lower face of the main part comes into contact with an edge on the downstream side of the first recess, the stopper member is turned around the edge into a protrusion posture where the distal end protrudes above the sheet stacking face.