A method of automatically mounting read-made headliners into automotive bodies consecutively moved along an assembly line by a conveyor system, by loading a headliner provided with a coating of adhesive on its upper surface onto a support at a first position of the assembly line, moving the support with the headliner thereon into a window-cut out of an automotive body, connecting the support to the moving conveyor system to prevent relative movement between the headliner and the automotive body, raising the support to move the adhesive coating on the headliner against the ceiling of the body to affect an adhesive bond therewith while at the same time moving a support member against the roof of the body to counteract the pressure of the headliner against the ceiling, removing the support and the support member, respectively, from the body at a second position of the assembly line, and returning the support to the first position.