Fluid pressure-feeding device

A purpose of the present invention is to provide a fluid pressure-feeding device that can pump out and pressure-feed a pumping fluid from a bag in which said fluid is housed, leaving a sufficiently small amount remaining, even when said bag has a fluid-housing section and a non-fluid-housing section. A fluid pressure-feeding device has: a container that houses a bag; a plate that is mounted in the interior of the container, above the bag; and a pump that suctions a fluid housed in the bag. It is possible to use the pump to suction and pressure-feed the fluid via an opening formed in the bag, while applying a pressing force to the bag via the plate. There is a seat section that is positioned on the bottom side of the container and can form a storage space section. By having a bag that has a fluid-housing section and a non-fluid-housing section be housed in the container as the bag, the non-fluid-housing section can be housed in the storage space section.