a theatre chair having a frame to which there is connected at least a seat component and a backrest component and , providing means on the seat component to co - operate with a seat member and means on the backrest component to co - operate with a backrest member whereby the seat member and backrest member can each be readily attached to the appropriate component to be positively affixed thereto , the members being able to be removed from the appropriate component when required . the connection between the components and the members can be by way of interacting lugs , interacting ribs and means whereby the parts are held in compression and tension . means to rapidly replace the upholstery and means whereby the same components can be used for chairs of different widths are also disclosed .