A paper feeding device comprising: a paper feeding tray on which multiple sheets are stacked in a vertical direction; sheet feeding means for horizontally feeding one sheet located on the top of the multiple sheets stacked on the paper feeding tray; a pair of feeding rollers that are disposed adjacent to the paper feeding tray, and that grasps a leading edge in a moving direction of the sheet fed by the sheet feeding means so as to deliver the sheet in a direction away from the paper feeding tray; and a transporting conveyor that transports the sheet delivered from the feeding rollers, characterized in that the feeding rollers are variable speed rollers which can increase and decrease circumferential speed while one sheet is delivered entirely from the leading edge in the moving direction to a trailing edge in the moving direction, wherein the transporting conveyor is a variable speed conveyor in which the transporting speed of the transporting conveyor is set to be slower than an average circumferential speed obtained from when the feeding rollers grasp the sheet until the feeding rollers grasp the subsequent sheet, so that the subsequent sheet presses a trailing edge of the previously supplied sheet by causing the subsequent sheet to partially overlap an upper side of the sheet previously supplied onto the transporting conveyor, and wherein the transporting speed of the transporting conveyor is changed in accordance with the length, size, thickness, or weight of the sheet so as to adjust an overlapping amount between the previously supplied sheet and the subsequent sheet, and a falling posture of the sheet is controlled so that the sheet is supplied to other devices. a paper feeding tray on which multiple sheets are stacked in a vertical direction; sheet feeding means for horizontally feeding one sheet located on the top of the multiple sheets stacked on the paper feeding tray; a pair of feeding rollers that are disposed adjacent to the paper feeding tray, and that grasps a leading edge in a moving direction of the sheet fed by the sheet feeding means so as to deliver the sheet in a direction away from the paper feeding tray; and a transporting conveyor that transports the sheet delivered from the feeding rollers, characterized in that the feeding rollers are variable speed rollers which can increase and decrease circumferential speed while one sheet is delivered entirely from the leading edge in the moving direction to a trailing edge in the moving direction, wherein the transporting conveyor is a variable speed conveyor in which the transporting speed of the transporting conveyor is set to be slower than an average circumferential speed obtained from when the feeding rollers grasp the sheet until the feeding rollers grasp the subsequent sheet, so that the subsequent sheet presses a trailing edge of the previously supplied sheet by causing the subsequent sheet to partially overlap an upper side of the sheet previously supplied onto the transporting conveyor, and wherein the transporting speed of the transporting conveyor is changed in accordance with the length, size, thickness, or weight of the sheet so as to adjust an overlapping amount between the previously supplied sheet and the subsequent sheet, and a falling posture of the sheet is controlled so that the sheet is supplied to other devices.