A conveyer device, including a chassis defining a first conveyer path and a second conveyer path; a pair of path members opposing to each other to form a part of the first conveyer path; a flapper configured to be pivotable among a first condition, wherein the flapper blocks the first conveyer path, a second condition, wherein the flapper allows the sheet conveyed in the conveying direction to pass thereby, and a third condition, wherein the flapper is separated from an opposing member; an urging member to urge the flapper; and a movable member movable between a first position, wherein the flapper in the first condition is contactless from the movable member, and a second condition, wherein the movable member contacts the flapper, is provided. The movable member separates one of the pair of path members from the other when moving from the first position to the second position.