A container base for a plastic box (100) for containing and transporting market garden produce prevents the deformation of the structure under stress and preserves the integrity of the produce stored inside the box (100), the base (200) being formed by a bottom frame (210) and by a bottom base (220), the bottom base (220) being vertically offset relative to the bottom frame (210), this offset being small and constant in the central zone of the bottom frame (210) and greater towards the corners of the box, forming a parabolic profile for the bottom base (220) with the highest point (221) at the corners and the lowest point (222) in the centre of each face of the bottom frame (210).
