Abstract: A seat support element having a frame and a padding mounted on the frame, extending between an internal surface, near the frame on an external side of the frame, and an external surface, opposite the internal surface and defining a bearing surface for an occupant of the seat. The support element includes a ventilation device for the bearing surface which includes a fan mounted on the frame and arranged to emit a gas flow toward the padding, and a bellows extending between the fan and the internal surface of the padding to transmit the gas flow of the fan to the padding. The bellows has a fastening tab passing through an orifice passing through the frame on the external side to an internal side of the frame, the fastening tab being attached to the frame on the internal side of the frame.