An illumination system includes illumination devices, an imaging device and a control device. Each of the illumination devices includes a light source, a lighting circuit unit and a transmission control unit. The control device includes a storage unit, a transmission processing unit and a main control unit for selecting a control-target illumination area, reading out the identification code corresponding to the selected illumination area from the storage unit and causing the transmission processing unit to transmit a signal containing a control command on the illumination device. The main control unit is operable in an initial setting mode in which the correlations between the identification codes of the illumination devices and the illumination areas are set by causing the imaging device to take an image of the illumination space while turning on the illumination devices and detecting the illumination area of each of the illumination devices from the image thus taken.