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 in an insertion direction, the staple inserting port being formed on a top surface of the casing, wherein the bottom surface and the top surface are perpendicular to the insertion direction; 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 insertion 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 in the casing from a side of the staple inserting port; a guide boss formed in the cover member; a guide portion which is formed in the casing and extending in the insertion direction, the guide boss being engaged with the guide portion to guide the cover member in the insertion direction; and a notch portion formed in the casing and extending from an edge of the staple inserting port in the insertion direction, the notch portion being formed between the staple discharge port and the staple inserting port in the insertion direction, wherein the notch portion includes a bottom end at an end of the notch portion in the insertion direction at a side of the staple discharge port, and wherein the casing includes one farthest end in one side in the insertion direction and the other farthest end in the other side in the insertion direction, characterized in that the bottom end of the notch portion positions in the insertion direction between the staple discharge port and a center of said one farthest end and the other farthest end of the casing in the insertion 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 in an insertion direction, the staple inserting port being formed on a top surface of the casing, wherein the bottom surface and the top surface are perpendicular to the insertion direction; 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 insertion 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 in the casing from a side of the staple inserting port; a guide boss formed in the cover member; a guide portion which is formed in the casing and extending in the insertion direction, the guide boss being engaged with the guide portion to guide the cover member in the insertion direction; and a notch portion formed in the casing and extending from an edge of the staple inserting port in the insertion direction, the notch portion being formed between the staple discharge port and the staple inserting port in the insertion direction, wherein the notch portion includes a bottom end at an end of the notch portion in the insertion direction at a side of the staple discharge port, and wherein the casing includes one farthest end in one side in the insertion direction and the other farthest end in the other side in the insertion direction, characterized in that the bottom end of the notch portion positions in the insertion direction between the staple discharge port and a center of said one farthest end and the other farthest end of the casing in the insertion direction.