This devise is formed to easily bond the cover of the luminaire, because as well as the installation of the lighting can be quick and simple, lighting covers more tightly coupled, and the consumer can be assured living, interior decoration effect so as to enhance the lighting relates to a cover structure coupled,; The subject innovation is provided a coupling structure for coupling the cover to the quadrangular frame is composed of a lighting board with quadrangular frame and the cover formed on the lighting board, a surface becomes the cover is slid into the quadrangular frame inside groove Joe right and left front and rear defined borders formed by the front, the border is the fixed to the lighting board formation, and the rear side edge the left and right be coupled configure one end of the frame connected to the secondary edge, and form a retracting hole at predetermined intervals in the secondary rim, the back rim face the left and right the infestation by ball and forming the retracting rod in a corresponding position, said retracting the retracting ball rod is coupled to the rear rim be fitted, and by finishing by a stopper, insert the spring in the retracting rods auxiliary border the inner rear edge with the spring elasticity It is configured to be a fixed combination.
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