An egg candling method capable of detecting abnormal eggs highly accurately regardless of the size of eggs and a device used for the method. A normalizing unit divides a first signal received via a first band pass filter that passes wavelengths large in internal abnormality-caused absorption by a second signal received via a second band pass filter that passes wavelengths different in absorption according to the colors of egg shells, and divides a third signal received via a third band pass filter that passes wavelengths small in internal abnormality-caused absorption by the second signal to give the division results to a difference calculation unit. The difference calculation unit calculates the difference between the results for input to a decision unit, which compares the difference with a threshold value and, if the difference is larger, outputs a signal indicating an abnormal egg.
