A detecting device detecting a skin region of a subject. The detecting device comprising: a first irradiation section that irradiates the subject with light of a first wavelength; a second irradiation section that irradiates the subject with light of a second wavelength; a captured image creating section that creates a first image based on light reflected from the subject when the subject is irradiated with light of the first wavelength, creates a second image based on light reflected from the subject when the subject is irradiated with light of the second wavelength, and creates an external light image based on light reflected from the subject when the subject is not irradiated with any light of the first and second wavelengths; and a detecting section that detects the skin region on the basis of the first image, the second image, and the external light image.