A seat for supporting the pelvis of the user in a correct physiological position substantially corresponding to the pelvic standing position. The seat has a dished gluteal position (16) which extends to the rear of the seat and a seat back (11) with a substantially convex upper portion (13) and a concave lower portion (12) with the distance between the junction (21) of the two and the lowest point (22) of the dished gluteal portion (16) substantially corresponding to the average dimension between the posterior superior spine of the ilia P and the ischial tuberosities (site bones) of an adult person.
