To perform printing to both front and rear ends of a paper sheet.

This printer is provided with a paper sheet feeding part 2, a printing part 3 and a paper sheet delivery part 4, a paper sheet P fed from the paper sheet feeding part 2 is fed by a feed roller 14 of the printing part 3 for each specified pitch, printing is applied to the paper sheet P by a printing head 12a, and the printed paper sheet P is discharged from the paper sheet delivery part 4. The paper sheet delivery part 4 is divided into the upstream side and the downstream side of the printing part 3, the printed paper sheet P is discharged from a downstream side paper sheet delivery part 4B by normally rotating the feed roller 14, and the printed paper sheet P is discharged from an upstream side paper sheet delivery part 4A by reversely rotating the feed roller 14.