Container (1) made of a plastic material, provided with a base (7) including a standing ring (8) forming a support flange (9) and a diaphragm (11) extending from the standing ring to a central portion (10), said diaphragm being capable of standing in an outwardly-inclined position, the diaphragm connecting to the standing ring at an outer junction (12) forming an outer articulation of the diaphragm with respect to the standing ring; the diaphragm connecting to the central portion at an inner junction (13) forming an inner articulation of the diaphragm with respect to the central portion; the diaphragm being invertible with respect to the standing ring to an inwardly-inclined position; the central portion having a thickness greater than the diaphragm, the central portion having an annular section (21) of greater thickness adjacent to the inner junction, the central portion having a central recess (22) thinner than the annular section and protruding upwardly from an inner edge of the annular section.