A staple-refill comprising: a casing in which a plurality of sheet-type connected staples are stacked and accommodated, the casing including a bottom wall defining a bottom surface; a staple inserting port which is formed in the casing and through which the sheet-type connected staples are inserted in the casing, the staple inserting port being formed on a top surface of the casing, wherein the bottom surface and the top surface are perpendicular to a stacking direction in which the sheet-type connected staples are stacked in the casing; a staple discharge port which is formed in the casing and from which the sheet-type connected staples in the casing are discharged, the staple discharge port being formed on a front surface of the casing including the stacking direction and a width direction in which each of staples of the sheet-type connected staples extends; a cover member which covers the sheet-type connected staples stacked in the casing; a guide boss formed in the cover member; a guide portion which is formed in the casing and extending in the stacking direction, the guide boss being arranged in the guide portion to guide the cover member in the stacking direction; and a notch portion formed in the casing and extending from an edge of the staple inserting port in the stacking direction, the notch portion being formed between the staple discharge port and the staple inserting port in the stacking direction, wherein the notch portion includes a bottom end at an end of the notch portion in the stacking direction at a side of the staple discharge port, and wherein the casing includes one farthest end in one side in the stacking direction and the other farthest end in the other side in the stacking direction, characterized in that the bottom end of the notch portion positions in the stacking direction between the staple discharge port and a center of said one farthest end and the other farthest end of the casing in the stacking direction. a casing in which a plurality of sheet-type connected staples are stacked and accommodated, the casing including a bottom wall defining a bottom surface; a staple inserting port which is formed in the casing and through which the sheet-type connected staples are inserted in the casing, the staple inserting port being formed on a top surface of the casing, wherein the bottom surface and the top surface are perpendicular to a stacking direction in which the sheet-type connected staples are stacked in the casing; a staple discharge port which is formed in the casing and from which the sheet-type connected staples in the casing are discharged, the staple discharge port being formed on a front surface of the casing including the stacking direction and a width direction in which each of staples of the sheet-type connected staples extends; a cover member which covers the sheet-type connected staples stacked in the casing; a guide boss formed in the cover member; a guide portion which is formed in the casing and extending in the stacking direction, the guide boss being arranged in the guide portion to guide the cover member in the stacking direction; and a notch portion formed in the casing and extending from an edge of the staple inserting port in the stacking direction, the notch portion being formed between the staple discharge port and the staple inserting port in the stacking direction, wherein the notch portion includes a bottom end at an end of the notch portion in the stacking direction at a side of the staple discharge port, and wherein the casing includes one farthest end in one side in the stacking direction and the other farthest end in the other side in the stacking direction, characterized in that the bottom end of the notch portion positions in the stacking direction between the staple discharge port and a center of said one farthest end and the other farthest end of the casing in the stacking direction.