disclosed is an led lighting device which is easily assembled and disassembled and has a stable assemblability without structural shaking . the led lighting device is able to improve a heat radiating characteristic and optical efficiency . the led lighting device according to the embodiment includes a lower case ; a light source unit disposed on one side of the lower case ; a light guide plate disposed in parallel with the light source unit ; and an upper case disposed on the light guide plate and coupled to the lower case in an attachable and removable way .