Abstract: A panel fitting device comprises a main part made of wire rod or plate material and a pressing part made of the same material connected together at one end so that they form a clearance for receiving an upper panel, and the other end of the main part has a supporting leg to hitch a base material such as a C-shaped channel. When the base material is hitched by the supporting leg and the main part and the pressing part are turned clockwise, the top part of the lower panel is caught between the main part and the base material, and then, the bottom end of an upper panel is inserted into the aforementioned clearance and the upper and lower panels can thus be easily installed.