Alighting apparatus, comprising: a light source unit comprising: a light source portion configured to mount a light source thereon, and a light distribution angle adjusting means coupled to the light source portion and configured to change an irradiation range of the light source, the light distribution angle adjusting means comprising: a reflector provided with a spiral guide portion in a peripheral surface thereof and configured to being rotated and configured to move a movable element and configured to reflect a light emitted from the light source, a movable body comprising an engaging portion configured to slidably engage the guide portion, a support configured to support a movement of the movable body in the rotation axis direction of the reflector, and an optical component, characterized in that the movable body comprises a control portion configured to limit a direction of a movement of the movable body to a rotation axis direction of the reflector, and the optical component is secured to the movable body and configured to change a light path of the light emitted from the light source. a light source unit comprising: a light source portion configured to mount a light source thereon, and a light distribution angle adjusting means coupled to the light source portion and configured to change an irradiation range of the light source, the light distribution angle adjusting means comprising: a reflector provided with a spiral guide portion in a peripheral surface thereof and configured to being rotated and configured to move a movable element and configured to reflect a light emitted from the light source, a movable body comprising an engaging portion configured to slidably engage the guide portion, a support configured to support a movement of the movable body in the rotation axis direction of the reflector, and an optical component, a light source portion configured to mount a light source thereon, and a light distribution angle adjusting means coupled to the light source portion and configured to change an irradiation range of the light source, the light distribution angle adjusting means comprising: a reflector provided with a spiral guide portion in a peripheral surface thereof and configured to being rotated and configured to move a movable element and configured to reflect a light emitted from the light source, a movable body comprising an engaging portion configured to slidably engage the guide portion, a support configured to support a movement of the movable body in the rotation axis direction of the reflector, and an optical component, a reflector provided with a spiral guide portion in a peripheral surface thereof and configured to being rotated and configured to move a movable element and configured to reflect a light emitted from the light source, a movable body comprising an engaging portion configured to slidably engage the guide portion, a support configured to support a movement of the movable body in the rotation axis direction of the reflector, and an optical component, characterized in that the movable body comprises a control portion configured to limit a direction of a movement of the movable body to a rotation axis direction of the reflector, and the optical component is secured to the movable body and configured to change a light path of the light emitted from the light source.