PURPOSE: To avoid double feeding of paper sheets, which takes place when the paper sheet layered on a paper feeding tray deforms to touch a paper feeding roller unexpectedly.

CONSTITUTION: A paper feeding tray is constituted in such a way that it can be attached in a freely detachable manner diagonally downward toward a paper feeding part 3 of a printer device 1. In the paper feeding part 3, a paper feeding roller 30, whose side view is of a letter 'D', is supported by a rotary driving shaft 32 that rotates intermittently, while the paper feeding roller 30 is arranged at a position being close to the bottom on the surface of layered paper sheets 15b on the paper feeding tray. With this, owing to the intermittent rotation of the paper feeding roller 30, the paper sheet is fed one by one. loosely attached to On the other hand, the rotary driving shaft 32 is loosely attached to a paper pressing body 31, in which longitudinal upper/lower pressing surfaces 31a are formed, in a freely rotatable manner, so that the contact between the flat peripheral surface of the paper feeding roller 30 and the surface of the layered paper sheets 15b is avoided and moreover the pressure contact between the circumferential surface of the paper feeding roller 30 and the paper sheet 15b is allowed.