The present invention refers to a seat assembly (1) for a passenger conveyance device, especially of a wheelchair or of a scooter, with a seat frame for carrying a seat cushion, wherein the seat cushion comprises a central cushion member (5), placed on at least one central seat member (750), between two lateral cushion members (3, 7), each placed on a lateral seat member (300, 700), with at least one of the two lateral seat members (300, 700) being removable from the seat assembly together with the respective lateral cushion member (3, 7) placed thereon.
