To obtain a deaerating packaging apparatus, which makes it possible to stably open the deaerating nozzle opening of a packaging material to enable a deaerating nozzle to be inserted into the packaging material without fail.

Respective heater blocks 46 comprising a temporary heat sealing part 40 has an end sealing part 48G and label sealing parts 48H, between which a heat insulating member 106 is arranged. The heat insulating member 106 is kept at a prescribed temperature by blows from a blower, so that the part of heat melting resin composing a packaging film 16 that comes in contact with the heat insulating member 106 is not melted, forming the deaerating nozzle opening which can be opened stably in a subsequent process, thus enabling the deaerating nozzle to be inserted into the packaging film without fail.