A vertical bag-making/filling/packaging machine (1) comprises: a film supply portion (5); a film engaging portion (31) which is engaged with a film (F); a vertical seal portion (60) which makes the film (F) into a tubular shape; a film conveying portion (50); a film clamp (34) which holds the film (F) at the film engaging portion (31); a film tension releasing portion (20) which loosens the film (F); a filling portion (70) which inputs the content (X); a weighing portion (40) which weighs the content (X); a lateral sealing portion (80) which makes the film (F) into a bag body (G); and a cutter which cuts off the bag body (G).