PROBLEM TO BE SOLVED: To provide an endoscope device capable of suppressing change in brightness in an observed image even in a case where a range for taking an image is shifted between a region emitting fluorescence and a region emitting no fluorescence.SOLUTION: Brightness in a brightness adjustment target is calculated by summing up brightness in a fluorescence image and a reference brightness image which are calculated by a fluorescent image brightness calculation circuit 62a and a reference brightness image brightness calculation circuit 62b and being respectively multiplied with a first coefficient k1 and a second coefficient k2 (with the proviso that k1
