An image detection device executing a detection process for images of a subject obtained by illuminating cyclically the subject with light having different spectral properties and capturing the subject at timings synchronizing with illuminating cycles of the light, the image detection device comprising a shift vector detection means that detects a shift vector of the subject based on a comparison result between an image of the subject captured at a current cycle and an image of the subject which is captured at a past cycle and is illuminated with the light having a same spectral property as that of the light illuminated at the current cycle.