A lighting device comprising: a cover comprising an upper portion, a central portion and a lower portion, the cover having an opening formed in the lower portion with an empty interior; a heat sink which comprises a top surface, a bottom surface, a side and a member which is disposed on the top surface; a light source which comprises a substrate disposed on the side of the member and light emitting devices disposed on the substrate, and has a center point; a socket to supply electric power to the light source; a circuitry disposed between the light source and the socket; and an inner case, wherein the member and the light source are inserted into the opening of the cover, the member including a top surface and side surfaces perpendicular to the top surface of the heat sink, wherein the heat sink comprises a plurality of heat radiating fins extended outwardly from the side of the heat sink, wherein each of a plurality of heat radiating fins includes a first point disposed furthest from the side of the heat sink in a second direction, wherein the inner case comprises a receiver receiving the circuitry, wherein the receiver is received within the heat sink through the bottom surface of the heat sink, wherein a first imaginary plane includes a top surface of the substrate, passes through the center point and is perpendicular to the top surface of the heat sink, wherein the first imaginary plan includes an axis passing through the center point, wherein a first angle between the axis and a first tangent line which passes through the center point and contacts with the sink is greater than and not equal to 0° and equal to or less than 45°, wherein a second imaginary plane includes the axis and is perpendicular to the first imaginary plane, the second imaginary plane passing through the center point and being parallel with the top surface of the heat sink, wherein a second angle between the axis and a second tangent line which passes through the center point and contacts the first point of the heat radiating fins is greater than and not equal to 0° and equal to or less than 45°, wherein the central portion of the cover has a diameter larger than a diameter of the top surface of the heat sink, wherein the cover is coupled to the heat sink, and wherein the upper portion and the lower portion or the cover are divided by the second imaginary plane, and a distance from the center point of the light source to the upper portion of the cover is larger than a distance from the center point of the light source to the lower portion of the cover. a cover comprising an upper portion, a central portion and a lower portion, the cover having an opening formed in the lower portion with an empty interior; a heat sink which comprises a top surface, a bottom surface, a side and a member which is disposed on the top surface; a light source which comprises a substrate disposed on the side of the member and light emitting devices disposed on the substrate, and has a center point; a socket to supply electric power to the light source; a circuitry disposed between the light source and the socket; and an inner case, wherein the member and the light source are inserted into the opening of the cover, the member including a top surface and side surfaces perpendicular to the top surface of the heat sink, wherein the heat sink comprises a plurality of heat radiating fins extended outwardly from the side of the heat sink, wherein each of a plurality of heat radiating fins includes a first point disposed furthest from the side of the heat sink in a second direction, wherein the inner case comprises a receiver receiving the circuitry, wherein the receiver is received within the heat sink through the bottom surface of the heat sink, wherein a first imaginary plane includes a top surface of the substrate, passes through the center point and is perpendicular to the top surface of the heat sink, wherein the first imaginary plan includes an axis passing through the center point, wherein a first angle between the axis and a first tangent line which passes through the center point and contacts with the sink is greater than and not equal to 0° and equal to or less than 45°, wherein a second imaginary plane includes the axis and is perpendicular to the first imaginary plane, the second imaginary plane passing through the center point and being parallel with the top surface of the heat sink, wherein a second angle between the axis and a second tangent line which passes through the center point and contacts the first point of the heat radiating fins is greater than and not equal to 0° and equal to or less than 45°, wherein the central portion of the cover has a diameter larger than a diameter of the top surface of the heat sink, wherein the cover is coupled to the heat sink, and wherein the upper portion and the lower portion or the cover are divided by the second imaginary plane, and a distance from the center point of the light source to the upper portion of the cover is larger than a distance from the center point of the light source to the lower portion of the cover.