Disclosed is an LED backlight unit for mirror lighting installed on a rear surface of a mirror. The disclosed LED backlight unit for mirror illumination includes: a substrate-the substrate is a first surface and a second surface facing each other, and a third surface that is perpendicular to the first surface, is formed to have a wider width than the first surface, and is opposite to each other. It has a fourth surface and is formed to be elongated in the longitudinal direction-and an LED module including a plurality of LED elements mounted along the length direction from the third surface, and is formed to be elongated and flexible to be installed in a curved section. A frame member comprising an LED module insertion portion formed of a material and allowing insertion of the LED module, and a light reflection portion having a curved surface to reflect light emitted from the plurality of LED elements, The LED module insertion portion and the light reflection portion are integrally formed.
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