An imaging apparatus equipped with a flicker detection function and including an image sensor of a rolling shutter type calculates a Fourier spectrum including an amplitude and a phase for each of two captured images acquired by the image sensor and having different imaging timings by performing Fourier spectrum analysis based on a flicker period serving as a detection target, and judges that flicker with the flicker period serving as the detection target has occurred, when the amplitude of a calculated Fourier spectrum and the phases of the two Fourier spectrums satisfy predetermined conditions and a sum of squares of a pixel value difference between the two captured images for each pixel is larger than a predetermined sum of squares.