The present invention is intended to improve the visibility of the tumor fluorescent substance is integrated, a tumor detecting illumination device 1 for emitting excitation light for the fluorescent substance which is integrated into the tumor, and the excitation wavelength of the fluorescent substance It comprises a light emitting diode 7 emits substantially matching light, provided on the light emitting side of the light emitting diode 7, and a blocking part 8 which blocks the same wavelength and at least part of the excitation wavelength of the fluorescent substance.本発明は、蛍光物質が集積した腫瘍の視認性を向上させるものであり、腫瘍に集積させた蛍光物質に対する励起光を射出する腫瘍検出用照明装置１であって、前記蛍光物質の励起波長と略合致する光を射出する発光ダイオード７と、該発光ダイオード７の光射出側に設けられ、前記蛍光物質の励起波長の少なくとも一部と同一の波長を遮断する遮断部８とを備える。
