This playback device (100) is provided with: an optical pickup (6) by which an optical disk (1) constituting a super-resolution medium is illuminated by playback light; an RF signal processing circuit (9) for converting reflected light to a playback signal; an i-MLSE detection unit (141) for evaluating the quality of the playback signal; and a spherical aberration correction unit (142) for correcting spherical aberration, using the result of quality evaluation of the playback signal.
