The invention provides a pressure flange of a filling packaging machine, which can restrain splashing of spray from a content liquid level when forming a content filling container from tubular packaging materials. A pressure flange (2) is installed on the periphery of a filling tube (14) in a mode of being located lower compared with a content filling standard, and forms a circular passage (S) between the peripheral surface (2a) and the internal peripheral surface of a tubular packaging material (T). The circular passage allows part of content fluid pressure generated in forming of the container to release upwards. A groove (3) extending from the lower edge to the upper edge is formed on the peripheral surface (2a), wherein at least the upper side portion is composed of spirally inclined slots (31).