Abstract: The present invention relates to register. adjustment apparatus for varnishing unit and, specifically, aims at virtually executing register adjustment in relation to varnishing unit which does not comprise register adjustment means in itself For this purpose, varnishing unit select button 38a for virtually selecting varnishing unit 26 as control object and adjustment program for varnishing unit are provided in register adjustment apparatus for printing unit 10. Register deviation which is input from numerical input button group 40 is converted in order to work register adjustment means 20 of printing unit 10 as needed. Thereby, machine production cost can greatly be reduced and aesthetic varnish coating can be done, because virtual register adjustment is executed by utilizing register adjustment means of printing unit.