PURPOSE: A streetlight is provided to improve a heat radiation function by optically uniting a cover glass with an LED module and to change an irradiating direction and to widen an irradiating area. CONSTITUTION: An LED module is composed in order to arrange a plurality of LEDs on one side of a substrate. A cover glass(160) is optically combined with an LED module. A heat radiation body(120) comprises a lower side which is contiguous to the substrate. The lower side of the heat radiation body comprises a surface contact part corresponded to a part of the substrate. A contact surface(125) of the surface contact part has an acute angle about the side of the cover glass. A heat radiation pad is placed between the surface contact parts.
