The invention relates to an air core filling system for reclining or seating furniture, for example, for a mattress, an armchair, a car seat, a piece of camping furniture or similar, comprising an air core and an integrated air core filling system, reacting to a load, which independently, supplies a dosed amount of air into the air core, in order to maintain the same at a given adjustable pressure in the non-loaded state. Said air core filling system comprises an air pump system (3) with at least two separate chambers (2, 6) and control system (17), whereby the first chamber (2) is directly connected to the air core by a line (1) and a second chamber (6) is connected to the air core by a line (7) through a pressure regulation valve (13) and to the ambient air by a line (9). The air pump system (3) is preferably embodied in the form of a double-chamber bellows, whereby the chambers (2, 6) have a common defining surface (4), on which a return device, for example, a spring (5), acts, in order to almost completely empty the chambers (2, 6) on relief of the air core.