A paper feeding device including: a paper feeding device body; a paper feeding cassette which is contained in the paper feeding device body so as to be freely drawn out; a guide part for guiding the paper feeding cassette with respect to the paper feeding device body along a substantially rectilinear line; a stopper for locking the paper feeding cassette on the way of drawing out the paper feeding cassette from the paper feeding device body; and a stopper releasing part which is integrally formed with the guide part and adapted to be flexed according to operation of drawing out the paper feeding cassette, thereby to release the lock of the stopper.