A controller is configured to determine which of a first position and a second position is located at a farther downstream side in a moving direction of an ejector and to set a determined position as a turn position. The first position is a first distance away from an image formation end position in the moving direction. The second position is a second distance away from an image formation start position in the moving direction. The image formation end position is an end position of image formation onto a sheet in a conveyance process of the ejector before turning at the turn position. The image formation start position is a start position of image formation onto the sheet in a conveyance process of the ejector after turning at the turn position. The second distance is longer than the first distance.