A post-processing device (10) includes: a loading section (20) that has a loading surface (22) directed obliquely upward and in which a recording medium (P) is loaded on the loading surface in a state where one end (P2) of the recording medium is directed downward; a supporting section (50) that supports the one end of the recording medium loaded on the loading surface; and a correcting section (170) that has a facing surface (172) facing toward the loading surface and that corrects deflection of the recording medium by coming into contact with the recording medium in a posture in which a lower end portion of the facing surface approaches closer to the loading surface than an upper end portion from a side of the recording medium, which is loaded on the loading surface, opposite to the loading surface and by thereafter coming into contact with the recording medium while moving such that the upper end portion approaches the loading surface in a state where the lower end portion is in contact with the recording medium.