LED unit

An LED unit comprising:

• a plurality of LED modules each having an LED chip for generating ultraviolet ray provided in a package which has an opening formed on one surface and a lens provided to cover the opening of the package;
• substrate-shaped base blocks on which the LED modules are arranged in a first direction;
• and
• a heat radiation member where the base blocks are provided in a second direction perpendicular to the first direction,
• wherein the heat radiation member has a plurality of inclined surfaces on which the base blocks are disposed, and the inclined surfaces include first inclined surfaces on a first side of the heat radiation member and second inclined surfaces on a second side of the heat radiation member disposed opposite to each other in the second direction and wherein the first inclined surfaces are inclined toward the second inclined surfaces in the second direction, wherein a surface between the first inclined surfaces and second inclined surfaces is a plane area, and
• wherein there is formed a step between every two neighboring first inclined surfaces and every two neighboring second inclined surfaces, the step providing a height difference between every two neighboring first inclined surfaces and every two neighboring second inclined surfaces.