A first sheet transfer guide plate includes a first divided sheet guide plate and a second divided sheet guide plate separable from each other. The first divided sheet guide plate is capable of being drawn out or pushed in relative to the second sheet transfer guide plate in a sheet width direction. The first divided sheet guide plate and the second divided sheet guide plate are separable from each other by a draw-out operation or a push-in operation of the first divided sheet guide plate. The first divided sheet guide plate is configured to release nipping of a sheet by paired sheet transfer rollers corresponding to the first divided sheet guide plate, along with the draw-out operation or the push-in operation of the first divided sheet guide plate.