A staple-refill comprising: a casing in which a plurality of sheet-type connected staples are stacked and accommodated; 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 is formed on one of two surfaces (12f, 12e) of the casing which 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 is formed on another 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; wherein the casing includes a rear surface formed with an opening (20a, 20c) through which an inner side of the casing is exposed, characterized in that the opening (20a, 20c) has a size into which a finger of a user can be inserted and functions as a finger gripping portion or handle portion on which a finger grips, and a position in which the opening (20a, 20c) is formed is a height of the top surface of the cover member facing an outside through the opening (20a, 20c), when the sheet-type connected staples are completely consumed. a casing in which a plurality of sheet-type connected staples are stacked and accommodated; 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 is formed on one of two surfaces (12f, 12e) of the casing which 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 is formed on another 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; wherein the casing includes a rear surface formed with an opening (20a, 20c) through which an inner side of the casing is exposed, characterized in that the opening (20a, 20c) has a size into which a finger of a user can be inserted and functions as a finger gripping portion or handle portion on which a finger grips, and a position in which the opening (20a, 20c) is formed is a height of the top surface of the cover member facing an outside through the opening (20a, 20c), when the sheet-type connected staples are completely consumed.