To properly determine the presence/absence of flicker even when time intervals between photometry are longer than a flicker period.

A photometric device comprises: a photometric unit for performing a plurality of times of photometry; a conversion unit which converts a lapsed time from a reference time to each of the plurality of times of photometry to a phase in a specific period; a detection unit which detects correlation between a relation of the output value of photometry to the phase and a specific period; and a determination unit which, when the correlation detected by the detection unit is higher than a predetermined reference, determines that a flicker of a specific period is included in photometric output by the photometric unit.