To provide a lighting device that can concentrate optical axes of respective light sources on one point when light from the plurality of light sources is irradiated on an irradiated body and improving its light-concentrating property and consequently improving parallel property for emitting parallel light and finally making the light from the plurality of light sources easily reach the distance and having an amount of light reaching the irradiated body at a uniform level.

The lighting device includes a plurality of light sources arranged on a concave arc, a spherical lens for receiving light from one light source among the plurality of light sources, and a focusing lens for focusing the light emitted from the spherical lens. A plurality of units wherein each is formed by one of the light sources, one spherical lens, and one focusing lens are arranged. Light emitted from the respective units is concentrated on one point, and a collimator lens as an aspherical lens for adjusting the focal point of the respective concentrated light is arranged.