An image forming apparatus includes a housing provided with an opening opposed to a developer carrying member that carries developer; a collecting member provided along a downstream edge of the opening in a transporting direction of the developer and capable of coming into contact with and separating from the developer carrying member; a sealing member provided along an upstream edge of the opening in the transporting direction; a suction member that sucks air from the opening; a suction path provided between the opening and the suction member; an opening-closing unit that opens or closes the suction path; and a controller that controls the opening-closing unit so as to open the suction path at a time that is before separation of the collecting member from the developer carrying member and a predetermined time period after the time of contact between the collecting member and the developer carrying member.