[Object] To provide an LED illuminating device having small color unevenness regardless of unevenness of luminance and emission colors of LEDs at a low cost. [Means for settlement] A LED illuminating device includes: a power source device 1; a controller 2; an LED lighting device 3; and an LED unit 4 incorporating LEDs of a plurality of emission colors and is configured so as to: mix the lights of the LEDs at an arbitrary proportion; and set the lights in an arbitrary color mixture proportion on the basis of a dimming signal from the controller 2, wherein the LED illuminating device is configured so that: a coefficient specific to the LED unit 4 at which an emission color of the LED unit becomes a desired color can be set to a signal value of the controller 2 preliminarily set as a standard; and the LED lighting device 3 can control an emission amount of the LEDs having the respective emission colors by using a value calculated by a calculation expression employing the specific coefficient.
