A light emitting device comprising: a substrate comprising a plurality of unit light emitting regions; and first to fourth insulating layers (INS1, INS2, INS3, INS4) sequentially disposed on the substrate, wherein each of the unit light emitting regions comprises: at least one light emitting element on the first insulating layer, the at least one light emitting element comprising a first end portion and a second end portion in a length direction thereof; first and second partition walls (PW1, PW2) on the substrate, the first and second partition walls (PW1, PW2) being spaced apart from each other; a first reflective electrode on the first partition wall, and a second reflective electrode on the second partition wall; a first contact electrode on the first reflective electrode, the first contact electrode connecting the first reflective electrode and the first end portion of the light emitting element; a second contact electrode on the second reflective electrode, the second contact electrode connecting the second reflective electrode and the second end portion of the light emitting element; and a conductive pattern between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second reflective electrodes when viewed on a plane. a substrate comprising a plurality of unit light emitting regions; and first to fourth insulating layers (INS1, INS2, INS3, INS4) sequentially disposed on the substrate, wherein each of the unit light emitting regions comprises: at least one light emitting element on the first insulating layer, the at least one light emitting element comprising a first end portion and a second end portion in a length direction thereof; first and second partition walls (PW1, PW2) on the substrate, the first and second partition walls (PW1, PW2) being spaced apart from each other; a first reflective electrode on the first partition wall, and a second reflective electrode on the second partition wall; a first contact electrode on the first reflective electrode, the first contact electrode connecting the first reflective electrode and the first end portion of the light emitting element; a second contact electrode on the second reflective electrode, the second contact electrode connecting the second reflective electrode and the second end portion of the light emitting element; and a conductive pattern between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second reflective electrodes when viewed on a plane. at least one light emitting element on the first insulating layer, the at least one light emitting element comprising a first end portion and a second end portion in a length direction thereof; first and second partition walls (PW1, PW2) on the substrate, the first and second partition walls (PW1, PW2) being spaced apart from each other; a first reflective electrode on the first partition wall, and a second reflective electrode on the second partition wall; a first contact electrode on the first reflective electrode, the first contact electrode connecting the first reflective electrode and the first end portion of the light emitting element; a second contact electrode on the second reflective electrode, the second contact electrode connecting the second reflective electrode and the second end portion of the light emitting element; and a conductive pattern between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second reflective electrodes when viewed on a plane.