This endoscope illumination device (12) is provided with: a light conversion unit (28) which converts primary light emitted from a primary light source (36) to secondary light having different optical characteristics and emits at least part of the secondary light as detection light and illumination light a detection light extraction unit (42) which receives the detection light and outputs a detection light output signal according to the amount of the light and an operation determination unit (50) which determines the operation of the light conversion unit. The light conversion unit comprises first and second light conversion members. The detection light includes at least one of direct-illumination-type first light conversion light and indirect-illumination-type first light conversion light. The direct-illumination-type first light conversion light is converted from primary light which is received by the first light conversion member. The indirect-illumination-type first light conversion light is converted from part of second light conversion light which is received by the first light conversion member, the second light conversion light being converted from primary light received by the second light conversion member. The operation determination unit determines the operation of the first and second light conversion members on the basis of the amount of change in the detection light output signal outputted from the detection light extraction unit.Cette invention concerne un dispositif déclairage dendoscope (12) comprenant : une unité de conversion de lumière (28) qui convertit la lumière primaire émise par une source de lumière primaire (36) en lumière secondaire ayant des caractéristiques optiques différentes et émet au moins une partie de la lumière secondaire sous forme de lumière de détection et de lumière déclairage une unité dextraction de lumière de détection (42) qui reçoit la lumière de détection et génère un signal de sortie de lumière de détection en fonct
