A holding jig for a thin cylindrical work includes a holding member which holds the work from an inner peripheral side and a diameter changing unit which changes a diameter of the holding member. The first radio monitors a first signal received from a third radio to determine if the third radio is active. A controller of the inkjet printer is configured to execute a printing process, a standby process, and a capping process in which the controller causes the carriage to move to the non-printing area and moves the cap from the uncap position to the capping position. The virtual input device comprises a plurality of virtual keys.