An illumination apparatus includes an image sensor 11, an arithmetic unit 12, a control unit 13, and a light source unit 14. The light source unit 14 can irradiate at least red, green, and blue lights. Thee image sensor 11 photographs an object illuminated by the light source unit. The arithmetic unit 12 calculates color components distributed on the object on the basis of a photographed image. The control, unit 13 controls color lights of the light source unit according to the color components distributed on the object calculated by the arithmetic unit.