A controller (6) is configured to drive a conveying roller (18) to allow a sheet (P) to abut on a registration roller (31) and stop, and to drive the registration roller to convey the sheet abutting on the registration roller to the printing unit (3) at a set sheet interval. The controller is configured to control a conveying speed of the conveying roller based on a time from a first timing to a second timing, the first timing at which a preceding sheet conveyed from the registration roller to the printing unit exits the conveying roller, the second timing at which a following sheet reaches the conveying roller.