Abstract: Chair including a base structure, a seating structure having a seat of predetermined depth and a connecting structure for connecting the base structure and the seating structure. The base structure and the seating structure each include two coupling parts which extend along corresponding extension axes, and the connecting structure includes two connecting nuclei at the sides of the two structures, having a limited depth with respect to the depth of the seat. Each connecting nucleus includes two coupling counter slots which may interlock with the two coupling parts of the base structure and with the two coupling parts of the seating structure, respectively, along the extension axes of the above-mentioned coupling parts.