To provide a pressure pad for obtaining god seals for both of a bottom on which the liquid leakage prevention measure is applied and a bottom on which the measure is not applied and provided on a bottom heat sealing device of a filling machine for a paper container for a liquid.

A pressurizing portion 12B having the shape almost equal to those of folding pieces 7f and also having the height approximately 1/2 of the thickness of a paper container material is formed on the position whereon the thickness of the paper container material is reduced by folding pieces 7f formed inside an outer bottom wall panel 7 out of a pair of outer bottom wall panels 6 and 7 extending from a body panel on a pressurizing face 11 of a pressure pad 10C in the case the pressure pad is used for the paper container for a liquid for which the liquid leakage prevention measure is applied.