Abstract: A panel joining mechanism (1) has a post (10) composed of a flat rear wall (11) adapted to be positioned in confronting relation to an attachment (40) for being securely joined to the attachment (40), and a pair of side walls (12) extending from respective opposite ends of the flat rear wall (11) away from the attachment (40), the side walls (12) having respective ends bent inwardly into a pair of respective bent portions (13) with an opening defined therebetween, a panel joiner (20) having a substantially inverted .OMEGA.-shaped cross section and disposed between the bent portions (13), at least a pair of panels (30L, 30R) having respective elastic portions (34L, 34R) on respective marginal side edges thereof. The panel joiner is detachably fitted in the post (10) through the opening, and the panels (30L, 30R) are joined to the panel joiner (20) with corresponding ones of the elastic portions (34L, 34R) detachably fitted in the panel joiner (20).