PRINTER

PURPOSE:To prevent a required printing content from being positionally shifted even with the occurrence of an error in mounting a head by providing a first printing control part for printing a first required printing content and a mark and a second printing control part for starting printing in accordance with a second required printing content when a mark sensor detects the mark. CONSTITUTION:When a first printing control part 13 detects a printing execution instruction S1, it prints a mark 14 on releasable mount paper 2 sideward of a label 31 and, simultaneously, dries a first head 5 so that a first required printing content 15 imparted as first printing information D1 is printed. A mark sensor 16 for detecting the mark 14 is disposed on a printing position of a second head 7 and detects the mark which has been printed by the first head 5 correspondingly to the label 31. When the mark sensor 16 detects the mark 14, a second printing control part 17 drives the second head 7 so that a second required printing content 18 imparted as second printing information D2 is printed.