PURPOSE: A lighting device is provided to improve heat radiation efficiency by electrically connecting a light source part to a driving part. CONSTITUTION: A radiation body(600) includes a base part(610) and a protrusion part(670). A light source part(400) is mounted on the protrusion part and emits a light. The light source part includes a substrate(410) and a light emitting element(430) arranged on the substrate. A driving part(500) is electrically connected to the light source part. A optical plate(200) emits a light from the light source part. A reflecting body(300) is stored in an inner space of a housing(100) through a lower opening of the housing.
