To provide a lighting device capable of levelling an intensity distribution of emission light in a compact structure without the need of complicated aligning work, and to provide a projection display apparatus using the same.

The lighting device 10 is provided with a light source portion 1 consisting of a plurality of LEDs emitting light of different wavelengths, a first reflector 201 reflecting light emitted from a side face of each LED, a light tunnel 202 mixing light emitted by each LED with each other, and a second reflector 203 emitting light mixed in the light tunnel 202. When an area in which light emitted from a top face of one LED is emitted without being reflected at the first reflector 201, the light tunnel 202 and the second reflector 203 is called a first area, main light emitted from a side face of that LED is reflected at the first reflector 201, the light tunnel 202 and the second reflector 203, and is emitted from a second area other than the first.