Disclosed is a container made of a plastic material, provided with a base including a standing ring forming a support flange and a diaphragm extending from the standing ring to a central portion, the diaphragm being capable of standing in an outwardly-inclined position. The diaphragm connects to the standing ring at an outer junction forming an outer articulation of the diaphragm. The diaphragm connects to the central portion at an inner junction forming an inner articulation of the diaphragm. The diaphragm is invertible with respect to the standing ring from the outwardly-inclined position to an inwardly-inclined position. In the outwardly-inclined position, the diaphragm has an outer curved portion and an inner curved portion of opposite curvatures.