Abstract: An LED floodlight includes a main unit longitudinally formed by extrusion molding and having in one side an opening of a concave groove, and at least one LED unit attached to an inner bottom wall defining the concave groove in the main unit. The main unit is formed on a back side of the inner bottom wall of the concave groove by the extrusion molding and has at least one ventilating duct and open at upper and lower ends. An area having a large heat capacity is provided between the inner bottom wall to which the LED unit is attached and the ventilating duct. The main unit is configured such that the LED unit is turned on in a posture where a longitudinal direction of the ventilating duct defines a vertical direction thereby transferring heat conducted from the LED unit to an airflow going up through the ventilating duct.