Abstract: A delivery machine of a folder unit including endless transfer means disposed to pass in close proximity to a downstream side of a discharge portion of a folding machine for discharging, one-by-one, folded paper sheets while passing around guide wheels driven in synchronism with the operation of the folding machine. The delivery machine also includes an openable/closable folded paper sheet holding device sequentially disposed on the endless transfer means with predetermined gaps between them. A folded paper sheet holding operation device brings the folded paper sheet holding device at least from an open state to a closed state in close proximity to the downstream side of the discharge portion of the folding machine so as to allow them to hold one-by-one the folded paper sheets discharged sequentially from the discharge portion of the folding machine.