an image processing device detecting a skin area representing the skin of a person from an image obtained by imaging an object , includes : imaging means for imaging the object ; first illumination means for radiating light having a first wavelength from first and second positions determined based on the position of the imaging means ; second illumination means for radiating light having a second wavelength different from the first wavelength from third and fourth positions determined based on the position of the imaging means ; and detection means for detecting the skin area on either a first image obtained through imaging of the object performed by illuminating the object with the light having the first wavelength or a second image obtained through imaging of the object performed by illuminating the object with the light having the second wavelength .