A sheet dropping portion abuts on a sheet conveyed in a first conveyance direction by a pair of conveyance rotary members from above to drop the sheet onto a placement portion by pivoting from an upper position to a lower position. The guide portion is arranged above the placement portion and extends toward the placement portion, and guides the sheet toward an abutment portion in a case where the sheet on the placement portion conveyed in a second conveyance direction opposite to the first conveyance direction by a reverse conveyance portion comes into contact with the guide portion. The sheet dropping portion located at the lower position overlaps a part of the guide portion when viewed in a rotational axis direction of the pair of conveyance rotary members.