A first operation restriction portion forms a first step between the first operation restriction portion and a first operation portion. A second operation restriction portion forms a second step between the second operation restriction portion and a second operation portion. A first locking portion releases locking of a locked portion when a first push of pushing the first operation portion or a second push of pushing the second operation portion is performed. When the sheet stopper is rotated in response to the first push, a second locking portion stops the sheet stopper in a first upright state. When the sheet stopper is rotated in response to the second push, the second locking portion allows the sheet stopper to rotate beyond the first upright state. A third locking portion stops the sheet stopper in a second upright state.