Abstract: The invention relates to a chair or armchair with legs, and a seat and a backrest made in one piece with the seat. So that a chair or armchair of this type can be made stable and rigid, while preserving the essential advantages of production from plastic, at the same time making it possible for the chair or armchair to have a pleasing appearance, the legs are designed as plastic hollow parts, in which metal tubes have been received as stiffening elements.