PURPOSE: A united panel two sides attaching curing method is provided to simplify a work process and to improve quality by naturally drying a required size and thickness of a fiber panel. CONSTITUTION: A fiber thin panel(1) is processed and a gaffer both sided tape(8) is welded in an inner core material fiber part upper and lower central 1/3 longitudinal direction. A bond for woodwork(2) is spread in the core material upper and lower region where the both sided tape is spread. After removing the release paper of the both sided tape, it is welded on a thin panel. A fiber panel for a rear side is covered and pressed. The completed fiber panel is formed in order to be used as the body of the furniture.