Infant vehicle seat

The seat (2) has a frame (1) with a first part fixed to a vehicle seat, and a second part (9) adjustably connected to first part and to which a seat portion (25) is detachably and adjustably fixed. A back support (27) is connected to seat portion and pivotable freely through an adjusting angle, with upper side of back support remote from frame abutting against back portion (21) of vehicle seat.