Disclosed is a container, made of plastic material, and provided with a base including a standing ring forming a support flange, an inner wall, a diaphragm and 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, and connects to the central portion at an inner junction. 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 whole diaphragm is curved in radial section, with a concavity turned inwards with respect to the container. The diaphragm has a depth strictly greater than 1 mm.