A lighting device comprising: a body comprising a bottom surface, a light emitting module which is disposed on the bottom surface of the body; an optical member which is disposed on the light emitting module, allows light emitted from the light emitting module to pass therethrough, and is installed to be movable up and down with respect to said body along a central axis of the bottom surface of the body; and a reflector which is disposed between the body and the optical member and reflects light emitted from the light emitting module, wherein the reflector comprises at least two reflection plates, characterized in that wherein the reflection plates are unfolded when the optical member becomes farther from the light emitting module, and the reflection plates are folded when the optical member becomes closer to the light emitting module, wherein the light emitting module comprises a hinge loosely coupled to one end of the reflection plate, and wherein the reflection plate is coupled movably on the axis of the one end. wherein, when the lighting device is installed to emit light downwardly, the reflection plate is automatically folded by gravity and the optical member has inner surface contacting with the reflector, so that the shape of the reflector is changed according to the moving of the optical member, and wherein a light distribution angle and a light distribution range of light passing through the optical member are variable depending on the change of the shape of the reflector. a body comprising a bottom surface, a light emitting module which is disposed on the bottom surface of the body; an optical member which is disposed on the light emitting module, allows light emitted from the light emitting module to pass therethrough, and is installed to be movable up and down with respect to said body along a central axis of the bottom surface of the body; and a reflector which is disposed between the body and the optical member and reflects light emitted from the light emitting module, wherein the reflector comprises at least two reflection plates, characterized in that wherein the reflection plates are unfolded when the optical member becomes farther from the light emitting module, and the reflection plates are folded when the optical member becomes closer to the light emitting module, wherein the light emitting module comprises a hinge loosely coupled to one end of the reflection plate, and wherein the reflection plate is coupled movably on the axis of the one end. wherein, when the lighting device is installed to emit light downwardly, the reflection plate is automatically folded by gravity and the optical member has inner surface contacting with the reflector, so that the shape of the reflector is changed according to the moving of the optical member, and wherein a light distribution angle and a light distribution range of light passing through the optical member are variable depending on the change of the shape of the reflector. characterized in that wherein the reflection plates are unfolded when the optical member becomes farther from the light emitting module, and the reflection plates are folded when the optical member becomes closer to the light emitting module, wherein the light emitting module comprises a hinge loosely coupled to one end of the reflection plate, and wherein the reflection plate is coupled movably on the axis of the one end. wherein, when the lighting device is installed to emit light downwardly, the reflection plate is automatically folded by gravity and the optical member has inner surface contacting with the reflector, so that the shape of the reflector is changed according to the moving of the optical member, and wherein a light distribution angle and a light distribution range of light passing through the optical member are variable depending on the change of the shape of the reflector.