Post-processing device

A post-processing device comprising:

• a processing tray configured to place a medium after recording thereon;
• a transport unit configured to transport, in a transport direction, an upper most medium placed on the processing tray by contacting with an upper surface of the upper most medium placed on the processing tray;
• an alignment unit configured to align a downstream end, in the transport direction, of the medium placed on the processing tray;
• a pressing unit configured to press, against the processing tray, the medium placed on the processing tray;
• and
• a control unit configured to control an operation of the pressing unit, wherein
• the pressing unit is configured to move between a pressing position at which the medium placed on the processing tray is pressed and a retraction position at which pressing on the medium placed on the processing tray is released,
• the control unit is configured to, when the transport unit transports a transport medium after the transport medium is newly placed as an uppermost medium in a state in which one or a plurality of placed media are already placed on the processing tray, cause the pressing unit at the pressing position to press at least one of the placed media placed on the processing tray, and
• the control unit is configured to, after the transport unit is separated away from the transport medium, move the pressing unit from the pressing position to the retraction position.