Paper feeding device

The present invention discloses a paper feeding device to be used for a business machine. The paper feeding device comprises a tray, a guide plate and a guide plate stopper, wherein paper is placed on the tray, the guide plate moves relative to the tray and restricts the size of the paper, and the guide plate stopper sets the position where the guide plate stops when the guide plate is pushed from the center towards the outside. When the guide plate stopper is in a lock position, the guide plate stops at a first position corresponding to a first standard paper size; when the guide plate stopper is in an unlock position, the guide plate stops at a second position corresponding to an oversized paper size.