An infrared light imaging apparatus includes: a main body 10 including an input unit 11 such as a touch panel an illumination/imaging unit 12 movably supported by an arm 13 a pair of display units 14 and 15 and a treatment table 16 on which a patient 17 is placed. The illumination/imaging unit 12 includes: a camera capable of detecting infrared rays and visible light an infrared light source disposed in the outer circumferential part of the camera and a visible light source disposed in the outer circumferential part of the infrared light source. On the display unit 14, a current fusion image of an affected area and its surroundings of the patient 17 is displayed as a moving image, whereas on the display unit 15, a past fusion image of the affected area and its surroundings of the patient 17 is displayed as a still image.
