A subject information obtaining device according to the present disclosure includes: first image data obtaining means (252) arranged to obtain first image data based on a first detection signal obtained by detecting first photoacoustic waves generated by irradiating light in a first measurement state on a subject (130, 131) second image data obtaining means (252) arranged to obtain second image data based on a second detection signal obtained by detecting second photoacoustic waves generated by irradiating light in a second measurement state different from the first measurement state on the subject (130, 131) and image data output means (253) arranged to display the first image data and the second image data on display means (280) so as to compare the first image data and the second image data at the display means (280).
