Product bag processing device and product bag processing method

The present invention provides a product bag processing apparatus and a product bag processing method, the product bag processing apparatus comprising: a transport device having a transport surface for transporting a product bag in a transport direction; a product bag processing device for pressing a product bag between a conveyance surface and the pressing surface, the product bag processing device being provided with: a bag thickness detection device which is disposed on the upstream side in the conveyance direction with respect to the pressing device, and which detects the thickness of the product bag on the upstream side in the conveyance direction with respect to the pressing device; the thickness detector detects the thickness of the product bag; an interval adjustment mechanism that adjusts the interval between the conveyance surface and the pressing surface by raising and lowering the pressing surface; and a control unit that controls the interval adjustment mechanism on the basis of a signal from the