A sheet conveyer having a conveyer path to convey a sheet therein, a first path and a second path branched from the conveyer path, a flapper, a pair of pivot-shaft portions, and a supporting section, is provided. The flapper is movable between a first position to guide the sheet from the conveyer path to the first path and a second position to guide the sheet from the conveyer path to the second position. The pivot-shaft portions are located apart from each other in a widthwise direction. The pivot-shaft portions support the flapper pivotably. The supporting section is located between the pair of pivot-shaft portions in the widthwise direction. The supporting section supports the flapper pivotably. The supporting section includes a rotation-shaft portion being rotatable, a bearing portion, in which the rotation-shaft portion is fitted, and a buffer member located between the rotation-shaft portion and the bearing portion.