A light emitting device package comprising: a body; first lead frame and second lead frame disposed on the body such that respective facing side edges of the first lead frame and the second lead frame face each other in an aligned manner and a molding material forming the body is filled between the pair of lead frames, and a light emitting device electrically connected to the first lead frame and second lead frame, respectively, wherein the first lead frame and the second lead frame include respective first regions and second regions having different thicknesses, the first regions being thicker than the respective second regions, so that the first lead frame and the second lead frame each have a step resulting from the thickness difference between the respective first region and the respective second region, and the molding material covers the step, characterized in that: the second region includes a horizontal surface and the first region includes a vertical surface meeting the horizontal surface of the second region, wherein the horizontal surface and vertical surface have roughness, and in that the said respective facing side edges in the first regions of the first and second lead frame have a first protrusion and a first depression, and the said respective facing side edges in the second regions of the first and second lead frame have a second protrusion and a second depression, the second protrusion is bigger than and vertically overlapped with the first protrusion, the second depression is bigger than and vertically overlapped with the first depression, and the first and second lead frames are aligned such that the first protrusion and the second protrusion of at the first lead frame face with the first depression and the second depression of the second lead frame respectively, and the first depression and the second depression of the first lead frame face with the first protrusion and the second protrusion of the second lead frame respectively. a body; first lead frame and second lead frame disposed on the body such that respective facing side edges of the first lead frame and the second lead frame face each other in an aligned manner and a molding material forming the body is filled between the pair of lead frames, and a light emitting device electrically connected to the first lead frame and second lead frame, respectively, wherein the first lead frame and the second lead frame include respective first regions and second regions having different thicknesses, the first regions being thicker than the respective second regions, so that the first lead frame and the second lead frame each have a step resulting from the thickness difference between the respective first region and the respective second region, and the molding material covers the step, characterized in that: the second region includes a horizontal surface and the first region includes a vertical surface meeting the horizontal surface of the second region, wherein the horizontal surface and vertical surface have roughness, and in that the said respective facing side edges in the first regions of the first and second lead frame have a first protrusion and a first depression, and the said respective facing side edges in the second regions of the first and second lead frame have a second protrusion and a second depression, the second protrusion is bigger than and vertically overlapped with the first protrusion, the second depression is bigger than and vertically overlapped with the first depression, and the first and second lead frames are aligned such that the first protrusion and the second protrusion of at the first lead frame face with the first depression and the second depression of the second lead frame respectively, and the first depression and the second depression of the first lead frame face with the first protrusion and the second protrusion of the second lead frame respectively. the second region includes a horizontal surface and the first region includes a vertical surface meeting the horizontal surface of the second region, wherein the horizontal surface and vertical surface have roughness, and in that the said respective facing side edges in the first regions of the first and second lead frame have a first protrusion and a first depression, and the said respective facing side edges in the second regions of the first and second lead frame have a second protrusion and a second depression, the second protrusion is bigger than and vertically overlapped with the first protrusion, the second depression is bigger than and vertically overlapped with the first depression, and the first and second lead frames are aligned such that the first protrusion and the second protrusion of at the first lead frame face with the first depression and the second depression of the second lead frame respectively, and the first depression and the second depression of the first lead frame face with the first protrusion and the second protrusion of the second lead frame respectively.