This flicker reducing apparatus (200) includes: a line integral value getting section (210) which gets, based on values of pixels included in ones selected from a plurality of horizontal lines that form an image, line integral values of the selected horizontal lines with respect to each image; a discrete Fourier transform section (230) which performs, between the newest image and a number of other images gotten earlier than the newest one, a discrete Fourier transform on a sequence of the line integral values of the respective images; a linear approximation section (250) which obtains an approximation line based on phase information that has been collected as a result of the discrete Fourier transform and which extracts information about the flicker from the approximation line; a flicker coefficient calculating section (260) which calculates a flicker coefficient by reference to the flicker information; and a correction arithmetic section (270) which performs flicker reduction processing on the image signal using the flicker coefficient.