A lighting device comprising: a housing; at least one reflector disposed inside the housing; and a light source unit being disposed inside the housing and emitting light toward the reflector, wherein the light source unit comprises a light emitting groove disposed therein, the light emitting grooves comprising a basal surface sloped toward the reflector, and wherein a plurality of light emitting devices are disposed sloping along the basal surface in the light emitting groove, and wherein the light emitting groove comprises a projection part formed from the basal surface, the projection part blocking the light emitted directly from a plurality of the light emitting devices to the outside of the housing, characterized in that the lighting device comprises a coupling member having an insertion groove, and in that the light source unit comprises: a first body having a first coupling unit formed in an upper part thereof, the first coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a first sloping surface disposed in a lower part thereof; a second body having a second coupling unit formed in an upper part thereof, the second coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a second sloping surface formed in a lower part thereof; a middle body disposed between the first body and the second body; and a plurality of light emitting diodes mounted on the first sloping surface and the second sloping surface respectively, a housing; at least one reflector disposed inside the housing; and a light source unit being disposed inside the housing and emitting light toward the reflector, wherein the light source unit comprises a light emitting groove disposed therein, the light emitting grooves comprising a basal surface sloped toward the reflector, and wherein a plurality of light emitting devices are disposed sloping along the basal surface in the light emitting groove, and wherein the light emitting groove comprises a projection part formed from the basal surface, the projection part blocking the light emitted directly from a plurality of the light emitting devices to the outside of the housing, characterized in that the lighting device comprises a coupling member having an insertion groove, and in that the light source unit comprises: a first body having a first coupling unit formed in an upper part thereof, the first coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a first sloping surface disposed in a lower part thereof; a second body having a second coupling unit formed in an upper part thereof, the second coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a second sloping surface formed in a lower part thereof; a middle body disposed between the first body and the second body; and a plurality of light emitting diodes mounted on the first sloping surface and the second sloping surface respectively, wherein the light source unit comprises a light emitting groove disposed therein, the light emitting grooves comprising a basal surface sloped toward the reflector, and wherein a plurality of light emitting devices are disposed sloping along the basal surface in the light emitting groove, and wherein the light emitting groove comprises a projection part formed from the basal surface, the projection part blocking the light emitted directly from a plurality of the light emitting devices to the outside of the housing, characterized in that the lighting device comprises a coupling member having an insertion groove, and in that the light source unit comprises: a first body having a first coupling unit formed in an upper part thereof, the first coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a first sloping surface disposed in a lower part thereof; a second body having a second coupling unit formed in an upper part thereof, the second coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a second sloping surface formed in a lower part thereof; a middle body disposed between the first body and the second body; and a plurality of light emitting diodes mounted on the first sloping surface and the second sloping surface respectively, a first body having a first coupling unit formed in an upper part thereof, the first coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a first sloping surface disposed in a lower part thereof; a second body having a second coupling unit formed in an upper part thereof, the second coupling unit being attachable to and removable from the coupling member by using the insertion groove, and having a second sloping surface formed in a lower part thereof; a middle body disposed between the first body and the second body; and a plurality of light emitting diodes mounted on the first sloping surface and the second sloping surface respectively,