A packaging machine comprises a folding device 25 operable on a container 11 fitted around a mandrel 21 as stopped at a folding station V for folding an end portion 14 of the container to form the bottom thereof, and a pressure member 33 for pressing the container 11 against the mandrel 21 to hold the container 11 against an axial force exerted on the container 11 by the folding operation of the folding device 25. The pressure member 33 is biased by a spring 68 so that operation of the folding device 25 before starting the folding operation permits the pressure member 33 to press the container 11 against the mandrel 21. The container is released from the pressure member 33 against the spring 68 by operation of the folding device 25 subsequent to the folding operation thereof. <IMAGE>
