To properly feed papers stacked on a loading base without causing a sheet jamming and overlapping feeding.

This paper feeding device 1 provided in a paper feeding part of a paper processing device is provided with the loading base 4 for loading paper P, a paper feeding roller 6 arranged by opposing to the loading base 4, and a paper guide face 10 for knocking a tip of the paper P loaded on the loading base 4. The loading base 4 is inclined in such a way that it lowers gradually and forward in the direction of feeding of the paper P and is slidably provided along the paper guide face 10 in the direction of changing a distance between the paper feeding roller 6 and itself. The paper guide face 10 is arranged by forming an obtuse angle for a paper loading face 4a of the loading base 4, and a foot S of perpendicular drawn on the paper loading face 4a from the center of the paper feeding roller 6 is always arranged on the paper loading face 4a.