To provide a lighting device capable of improving heat radiation efficiency.

A lighting device 1 includes a light source 2, a light source holding body 3 for holding the light source 2, and a cylindrical casing 5 on which the light source holding body 3 is mounted and also a focus lens 4 is mounted on a front side on the light source holding body 3. The light source holding body 3 includes: a light source holder 12 for holding the light source 2 in a recessed part 11 opening frontward; and a plurality of heat sinks 13 mounted on the light source holder 12 so as to surround a rear side and a side of the recessed part 11 of the light source holder 12.