Provided is a smoothed image generating device which is capable of rapidly smoothing brightness information. A smoothed image generating device (1) includes: a reduced-size divided data generating section (11) which generates reduced-size divided data by extracting some of a plurality of regions from divided data, the divided data being obtained by dividing, into the plurality of regions, brightness data obtained by extracting brightness information from imaging data on a subject having uniform brightness; a smoothing processing section (12) which generates smoothed reduced-size divided data by carrying out a smoothing process with respect to the reduced-size divided data; and a smoothed image generating section (13) which generates smoothed image data, which is identical in size to the divided data, by interpolating between a plurality of regions constituting the smoothed reduced-size divided data.
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