To make a desired type easy to visually confirm when the desired type is selected to be arranged at the printing position of a printer and to lightly perform selection operation to enhance printing processing efficiency.

The endless printing strip 12a trained over the printing revolving roller 10a and printing support shaft 11a arranged in a housing 2 in a freely revolvable manner and having two or more kinds of printing parts M arranged on the outer peripheral surface thereof and the rotary operation plate connected to the printing revolving roller 10a are provided and the display strip 22a trained over the display revolving roller 20a and display support shaft 21a arranged in the housing 2 and having the display characters N corresponding to the respective printing parts M arranged on the outer peripheral surface of the printing strip 12a arranged on the outer peripheral surface thereof is revolved in synchronous relation to the printing strip 12a by the revolving operation of the rotary operation plate to oppose the display characters N corresponding to the printing characters of the printing parts M on a display window 5 to display them and these characters are visually confirmed to selectively expose the printing surface of the desired printing part M to a printing opening part 6.